The morning after Halloween, Matthew woke on the floating beanbag with a blanket across his legs, a stiff neck, and three unfinished runes hovering above his face.
The common-room fire had burned down to a quiet bed of red coals. Pale morning light pressed against the tower windows, revealing abandoned cups, sweet wrappers, half-completed essays and the remains of several paper decorations which had failed to survive the previous night's excitement. One carved pumpkin had somehow reached the top of a bookcase and was muttering darkly about being forgotten.
The beanbag floated ten inches above the carpet.
Its mustard-yellow fabric had acquired a black scorch mark where Peeves's saucepan had struck one of the stabilising seams. The temporary anti-poltergeist loop Professor Flitwick had added glimmered faintly beneath the lower edge. Every few seconds, the seat drifted one inch toward the fire, met its boundary line, and corrected itself with an offended wobble.
Matthew lay still while his awareness returned.
The curse pathway behind his right eye carried a dull pressure left over from the Mourning Lantern. The scars across his palm were warm but quiet. His right shoulder had stiffened because he had fallen asleep with the linked book resting against it, but the pain did not sharpen when he flexed his fingers.
Above him, the three runes continued turning.
PLACE.
WITNESS.
PRESENT.
They were incomplete copies of the relationship he had built in the Great Hall. Without the students naming themselves, without Flitwick expanding the structure and without the room answering, the runes possessed no meaningful power. They were only shapes made from memory and a very small amount of light.
Matthew studied them anyway.
The Mourning Lantern had filled the Hall before most students understood that it was dangerous. It had found private grief, given it familiar voices, and pulled attention away from the living people standing nearby. Matthew had recognised what it was doing, but recognition alone had not created protection.
He had needed time to raise his wand.
Time to build the first rune.
Time to explain what the others should do.
The whole defence had depended upon him remaining conscious, present and fast enough to complete it.
Matthew lifted his left hand. The half-formed runes responded, sliding into a single line above his palm.
"What if the spell existed before it was needed?" he whispered.
The nearest curtain opened.
Aidan Rookwood's head appeared around the side of the boys' staircase. His hair pointed in four unrelated directions, and one sleeve of his nightshirt had twisted halfway around his arm.
"What spell?"
Matthew let the runes dissolve.
Aidan descended the remaining steps, crossed the common room and stopped beside the floating beanbag. He looked at Matthew, the blanket, the closed linked book and the faintly glowing anti-poltergeist line.
"You slept there."
"Yes."
"You told McGonagall it was experimental furniture."
"It is."
"You slept on experimental furniture."
"The main structure had already passed stability testing."
Aidan pushed one finger against the edge. The beanbag sank beneath the pressure and returned to position.
"It tried to escape the Great Hall yesterday."
"Peeves altered the control tether."
"That does not sound like passing."
"The beanbag remained functional after unauthorised aerial use, collision with the Slytherin table and recovery from outside its approved height."
Aidan considered that.
"So it passed a more difficult test by accident."
"Yes."
"That feels like the sort of sentence you would reject from anyone else."
Matthew sat up carefully. The filling shifted beneath him, and the beanbag tilted before the central axis corrected.
"Accidental evidence is still evidence. It is not controlled evidence."
Aidan climbed onto the opposite edge without asking, though he did so slowly enough that the seat adapted rather than throwing either of them onto the carpet.
"What spell did you want to exist before it was needed?"
"A shield."
Aidan's sleepiness disappeared.
"On the beanbag?"
"No."
"That is disappointing."
Matthew opened the linked book.
The page remained grey for Aidan and cleared for him. Hermione had written during the night, though the final line had been added less than an hour earlier.
You did not report going to bed.
Matthew dipped his quill.
I fell asleep in the common room.
The response appeared before he finished setting down the ink bottle.
On the beanbag.
Yes.
That sentence does not improve the situation.
The beanbag remained stable.
Aidan leaned back against the floating fabric. "Is she criticising your sleeping arrangements?"
"She inferred them."
"That is different?"
"No."
Hermione's next line appeared.
How does your head feel?
Dull pressure. No increase in curse heat. No altered vision. Right shoulder stiff from sleeping badly.
A pause followed.
Stretch after breakfast. Do not pretend floating furniture has made posture optional.
Matthew looked at the sentence.
Aidan watched his face.
"What did she say?"
"That the beanbag has not replaced posture."
"She is right."
Matthew looked at him.
Aidan lifted both hands.
"I am capable of recognising truth even when it is inconvenient."
"That is recent progress."
Before Aidan could respond, Hermione wrote again.
What were the runes above you?
Matthew glanced toward the ceiling.
Remnants of the Present ward.
Why were they active?
I was considering whether a construct could hold a spell before danger occurred.
The linked page remained still for several seconds.
Then Hermione wrote:
Define construct.
Temporary self-supporting magical geometry. Not an enchanted physical object. Frame, charm, instruction, anchor and release.
You have been awake for how long?
Matthew looked at the clock.
Approximately nine minutes.
Of course.
Aidan grinned, though he could not see the page.
"She understands you."
Matthew ignored him and wrote:
The Mourning Lantern acted before most students could respond. A pre-built construct might hold a charm and release when defined conditions occur.
Hermione's handwriting became smaller and more deliberate.
You are proposing automatic magic.
Conditional magic.
That is automatic magic with better tailoring.
Matthew considered correcting the phrasing and decided she was close enough.
Partly.
Which charm?
Several. Lumos first. Levitation. Cushioning. Vermillious. Eventually Protego.
The book remained silent for long enough that Aidan began rocking the beanbag gently with his heels.
Hermione finally wrote:
Intent detection?
Matthew stopped.
He had not yet told her that part.
Possibly.
That means you already thought of it.
Yes.
Anger is not attack. Fear is not attack. An accident may be dangerous without hostile intent. A person may intend restraint while still casting a spell that harms someone. What exactly do you want the construct to recognise?
Aidan had stopped rocking.
He could not read Hermione's question, but he had seen Matthew's expression change.
"What?"
Matthew turned the ordinary notebook toward him and copied the problem.
Aidan read the four statements.
"Those are all true."
"Yes."
"So the shield cannot simply decide whether someone is being mean."
"No."
"That would have protected you from Cassian talking."
"It would also place a defensive spell between me and anyone angry nearby."
Aidan looked toward the staircase, where Cormac McLaggen could be heard arguing with his curtains.
"That may still be useful."
"It would be unpredictable."
Hermione added another line.
Do not build a spell that mistakes emotion for guilt.
Matthew stared at the sentence.
It belonged far beyond the experiment.
I will not.
Then begin with the action. Not the person.
Matthew copied that into the design notebook.
DETECT DIRECTED PURPOSE ATTACHED TO ACTION.
Beneath it, he added:
DO NOT CLASSIFY PEOPLE AS HOSTILE.
Aidan read the second line and nodded.
"That seems fair."
"You wanted it to shield me from conversation thirty seconds ago."
"That was before the design had principles."
The girls' staircase door opened.
Katie Bell came down wearing her school jumper over loose sleeping trousers, her hair tied badly at the back of her head. She had one of the revised flying sleeves draped around her neck and an expression which suggested she had intended to speak before noticing Matthew and Aidan sitting together upon floating furniture at sunrise.
She stopped near the bottom step.
"Why are you both awake?"
"Matthew is teaching a shield to wait," Aidan said.
Katie looked at Matthew.
"You have been awake for less than ten minutes."
"Twelve now."
"That does not help."
She crossed the common room and pressed one hand against the beanbag. The identity layer recognised her and lowered the near edge enough for her to sit beside Matthew. Her shoulder rested briefly against his left arm before she shifted the flying sleeve onto her lap.
"What does a waiting shield wait for?"
"Directed harmful action."
Katie's forehead furrowed.
"Like a spell?"
"Yes."
"What if someone throws something?"
"Possibly."
"What if they drop it?"
"That is an accident."
"It still hits you."
Matthew wrote:
ACCIDENTAL FORCE IS A SEPARATE CATEGORY.
Aidan looked pleased.
"The shield needs friends."
"It needs separate constructs," Matthew corrected. "A cushioning response may address accidental impact. Protego should not become responsible for everything."
Katie traced one of the diagrams with her fingertip.
"Then it is not one spell deciding what danger is. It is several spells each knowing one job."
Matthew looked at her.
"That is better."
Katie smiled. "I know."
Hermione's writing appeared on the linked page.
Who said that?
Matthew told her.
Katie is correct.
Katie could not see the words, but she recognised something in Matthew's expression.
"Hermione agrees?"
"Yes."
"Good."
Aidan leaned forward.
"Did she agree with anything I said?"
"No."
"You did not ask."
Matthew wrote:
Aidan says the shield needs friends.
Hermione replied:
That is a surprisingly useful summary.
Matthew read it aloud.
Aidan sat back with deep satisfaction.
The beanbag sank another inch under the combined weight of all three students. Its outer stability line brightened, assessed the load and corrected smoothly.
Katie looked down at it.
"This already uses several constructs."
"Several enchantments on one physical anchor," Matthew said. "A free construct would have no fabric or wood holding it."
"So what holds it?"
"The relationship among the runes."
Aidan looked uneasy.
"That sounds like saying a table holds itself up because the legs agree."
"That is roughly how a table works."
He looked down at the floating seat.
"I am surrounded by disturbing furniture."
Elara Vance entered the common room while buttoning one cuff. She took in the three children on the beanbag, the notebook full of shield diagrams and the linked book open in Matthew's lap.
"You began another project."
"It began itself," Aidan said.
Elara ignored him.
"What does it do?"
Matthew passed her the notebook.
She read the first page, turned it over and read the second.
"This cannot be tested in the common room."
"No."
"Professor Flitwick will need to approve the charm frame."
"Yes."
"Professor Wardwell will need to approve the threat conditions."
"Yes."
"The library will contain at least four books you claim are introductory and Madam Pince claims are inappropriate."
"Probably."
Elara returned the notebook.
"Breakfast first."
No one argued.
That was how Matthew knew she was right.
The eastern courtyard was cold enough that morning for every breath to show.
Tonks stood upon the training mat with her knees bent, her weight settled unevenly and both hands raised in what she believed was a convincing defensive posture. Her hair was bright pink, though the ends had become silver from the temperature.
Matthew walked around her slowly.
"You are waiting to be pushed."
"I am ready to be pushed."
"Your heels are carrying too much weight."
"I like my heels."
"That does not make the structure useful."
Tonks shifted forward by a fraction.
Matthew touched two fingers to her right shoulder.
She moved backward.
The reaction began before he applied any pressure.
"You anticipated."
"Knowing you are going to push me is not the same as imagining it."
"I had not decided whether to push."
Tonks narrowed her eyes. "You walked around me like a suspicious cat."
"Morrigan would consider that a compliment."
Aidan sat at the edge of the mat holding a cup of tea. Elara had brought a second notebook and was recording Matthew's observations concerning feints and movement. Katie stood beside one of the courtyard columns with three small cloth balls tucked beneath her arm.
The argumentative statue watched all of them from the corner.
It had not thrown anything yet.
That made Matthew more suspicious than usual.
Tonks reset her stance.
"What exactly are we testing?"
"The difference between intention, emotion, apparent movement and committed action."
"You have turned morning training into a Defence lecture."
"It was always related."
Tonks's hair shifted toward violet.
"That is the answer of someone pleased with himself."
Matthew stood opposite her.
"Touch my left shoulder."
She reached slowly with her right hand.
He moved aside before contact.
"Again. Faster."
Tonks's hand darted forward.
Matthew rotated from the waist, guided her wrist past him and released it without attempting a hold.
"Again."
This time her right shoulder moved first.
Matthew shifted left.
Her left hand tapped the centre of his chest.
He looked down.
Tonks grinned.
"Feint."
"You committed the shoulder and not the hand."
"Did you think the right hand was going to touch you?"
"Yes."
"Then intent detection failed."
"No. Observation failed. Your actual intention was attached to the left hand."
Tonks stepped back.
"Would a magical field know that?"
"That is the question."
Aidan raised his cup.
"I could help by attacking unpredictably."
"No," four people said at once.
He drank his tea.
Katie tossed one cloth ball from hand to hand.
"What if the construct watches the movement?"
"A feint becomes difficult," Matthew said. "The field might respond to the first committed vector even if the actual attack changes."
"What if it watches the person's magic?" Elara asked.
"Not every physical action carries active spellwork."
Tonks rolled one shoulder.
"And reading a person deeply enough to know what they intend becomes Legilimency."
Matthew shook his head. "Ward intent recognition is shallower. A threshold can recognise the purpose carried into contact without opening the whole mind."
"Like your east-gallery seal?"
"Yes. It asked what purpose was touching the boundary."
"But that purpose had already reached the ward," Elara said. "Your shield needs warning before the attack reaches you."
Matthew looked toward the space between himself and Tonks.
"Then the detection boundary must sit outside the shield."
Katie threw the cloth ball.
She had given no warning.
Matthew saw it too late to catch it cleanly. The ball struck his left shoulder and dropped to the mat.
Katie's eyes widened.
"Sorry."
Matthew picked it up.
"You intended me to catch it."
"Yes."
"The action was not hostile."
"It still hit you," Aidan said.
"Which means Katie's earlier distinction is correct. Intent detection does not address accidents."
Tonks took the ball from him.
"What if I mean to hit you but not injure you?"
She threw.
Matthew caught it.
"The action carries directed impact. Whether the construct should respond depends upon the threshold."
"Then harmful is not a yes-or-no category," Elara said. Her quill moved rapidly. "It needs magnitude."
"Or the construct only responds when a defined spell or force crosses the outer field," Matthew replied.
Tonks looked at the ball in his hand.
"You are getting closer. Intent arms it. Action confirms it."
Matthew became still.
Aidan noticed.
"That was the project face."
Katie smiled.
Tonks continued, now thinking aloud. "The ward feels directed purpose first. It does not cast yet. Then it checks whether something actually travels toward the protected person. If nothing follows, it settles again."
Elara added a third line beneath the diagram.
"And if something follows without hostile intent?"
"Another construct handles impact," Katie said.
Matthew crouched beside the notebook and wrote three headings.
INTENT GATE.
VECTOR GATE.
RELEASE CLOCK.
Aidan looked over Elara's shoulder.
"What does the clock do?"
"The shield cannot appear the moment intent is detected," Matthew said. "It would waste the spell on feints, hesitation or an attack that changes direction. The construct should wait until the actual threat crosses a nearer boundary."
"So it detects intent," Katie said, following the design, "then uses movement to decide when."
"Yes."
Tonks dropped into stance again.
"How long does it wait?"
"Not a fixed amount."
Elara tapped the page. "Distance rather than seconds."
Matthew nodded.
"A spell moves faster than a thrown object. The release point should depend upon the incoming vector."
Aidan frowned.
"Then why call it a clock?"
"Because it measures the approach."
"That is not what clocks do."
"It measures remaining time through distance and speed."
Aidan considered the explanation and decided it was probably too much effort to challenge before breakfast.
The statue's shoulder moved.
Matthew saw it.
So did Tonks.
Both shifted at once.
The pebble flew between them and struck Aidan's cup, knocking it from his hand. Tea spread across the stone.
Aidan stared at the statue.
"That was intentional."
The statue held its stone apple against its chest.
Katie retrieved the cup.
"Would the shield have triggered?"
"If it detected the statue's intent and the pebble's path," Matthew said.
Tonks looked at the spreading tea.
"Would it have been worth using a stored Protego to save a cup?"
"No."
"Magnitude again."
Matthew added it to the notes.
The construct was becoming less elegant with every useful question.
That was probably a sign that it was becoming real.
Professor Flitwick began Monday's Charms lesson by drawing a circle in the air without using chalk, wand tip or any visible surface.
The line remained.
It glowed pale blue above his desk, perfectly round and no wider than a dinner plate. Three smaller marks appeared inside it. One anchored the circle to the room. One defined its duration. The third identified the charm it would hold.
Flitwick raised his wand.
"Lumos."
White light left the wand tip and entered the circle.
The construct brightened.
Then Flitwick lowered his wand.
The light remained floating above him.
Aidan turned toward Matthew so quickly that his chair squeaked.
"He knew."
"Professor Flitwick has probably known about magical constructs for longer than this morning," Elara whispered.
"That is not what I meant."
Flitwick heard them anyway.
"I did not receive a prophetic warning concerning Mr Knight's breakfast designs," he said, his voice carrying lightly across the classroom. "Temporary charm constructs are a standard branch of advanced Charms. We are discussing only their simplest foundation."
His gaze found Matthew.
"The timing is coincidental."
Matthew believed him.
Mostly.
The Gryffindors shared the lesson with Hufflepuff. Cedric had stopped outside before class to ask whether the beanbag had survived Halloween. He had accepted the answer that it was being repaired and returned to his own timetable.
Professor Flitwick stepped down from the books behind his desk and walked beneath the glowing circle.
"A construct is not an enchanted object," he explained. "An enchantment gives a physical thing an ongoing magical behaviour. A construct creates a temporary magical thing whose structure is the spellwork itself."
He pointed upward.
"This has no parchment, stone, cloth, wood or metal supporting it. The relationship among its lines holds it together."
Katie leaned forward.
"What happens if one line breaks?"
"The construct usually fails."
Aidan raised his hand.
"Usually?"
"A badly designed one may release its charge in an unintended direction, attach itself to the nearest available anchor or continue performing only the portion of the instruction which remains intact."
The students became considerably more attentive.
Flitwick wrote five words on the board.
FRAME.
ANCHOR.
CHARGE.
INSTRUCTION.
RELEASE.
"The frame gives the magic shape. The anchor tells it where and to what it belongs. The charge is the charm placed inside. The instruction defines what it should do. The release explains how it ends."
Matthew copied every word.
Flitwick looked toward him.
"Mr Knight, your floating Lumos rune contained all five. The runic circle was the frame. The internal point anchored it to the classroom position. Lumos provided the charge. The openings instructed the light to leave without allowing the entire charm to disperse. The lower gap allowed safe collapse."
Matthew looked at the pale blue construct above the desk.
"I built the anchor too narrowly."
"Yes. Your charm continued pressing against the upper branch until that portion decayed."
The diagnostic parchment Professor Flitwick had given him remained in the Charms notebook.
"Could a construct move with a person?"
"It can, if anchored to the person, an item they carry or a defined distance from them."
"Could it hold a shield?"
The room quieted.
Flitwick did not answer immediately.
He returned to the stack of books and climbed onto them, placing himself high enough to look directly at Matthew across the desks.
"Yes."
Aidan grinned.
Flitwick held up one finger.
"That does not mean you will attempt it today."
Aidan stopped grinning.
"I was looking at Matthew."
"That makes the warning more necessary."
Matthew waited.
Flitwick continued.
"A light charm behaves gently. A shield receives force. It requires direction, strength, timing and a safe place for the redirected energy to go. A stored Protego is not a lantern with a different incantation."
"I know."
"You know enough to ask. That is not the same as knowing enough to build it without supervision."
Matthew nodded.
"Will you supervise?"
Flitwick's moustache twitched.
"Professor Wardwell and I will review a written proposal."
Aidan whispered, "That means yes."
"It means a written proposal," Flitwick corrected.
The practical lesson involved the smallest possible construct: a three-line frame carrying Lumos for no more than sixty seconds.
Every student received a black slate and a silver stylus. They first drew the frame physically, traced it with a wand, added the room anchor and spoke the incantation into the central mark.
Elara's first construct formed correctly but attached itself to her slate rather than rising above it. Katie's lifted, tilted sideways and projected light across the desk like a fallen lamp. Martin Pritchard created a perfect frame which contained no light because he forgot to cast the charm.
Aidan's frame appeared, accepted Lumos and immediately expanded to the size of a serving tray.
It rose until it struck the ceiling.
The light inside flashed bright green.
Flitwick cancelled it.
"What instruction did you give?"
"I wanted enough light for the whole room."
"You built a frame sized for one desk."
Aidan looked up at the faint green mark on the ceiling.
"The ambition exceeded the architecture."
Matthew turned toward him.
"That was useful."
Aidan appeared alarmed by his own success.
Matthew built his first construct from three golden lines.
The frame became a triangle rather than a circle because triangles were stable with fewer points. A small central hook anchored it six inches above the slate. The upper opening released light. The lower stroke defined dissolution.
"Lumos."
Gold entered the triangle.
It rose.
The construct remained perfectly still.
Too still.
Matthew watched four invisible support lines form around it, each one fixing the triangle against movement which no one had asked it to make.
Flitwick arrived beside him.
"You have placed a light in a prison again."
"The frame is stable."
"The room is not attacking it."
Matthew cancelled the outer lines one at a time.
The triangle drifted slightly in the warm air from the window.
His first impulse was to correct it.
He stopped.
The construct remained stable without remaining immovable.
Flitwick nodded.
"Better."
Matthew raised one finger and moved it slowly to the left.
The triangle did not follow.
"That instruction was not included," Flitwick said.
"I know."
"You are considering adding it."
"Yes."
"Do not add six functions to a first attempt because it survived one."
Matthew looked toward the construct.
"How many?"
"One additional movement instruction."
He added a directional relationship.
The triangle followed his finger.
Katie's face brightened.
"Make it circle."
Matthew drew one slow arc.
The construct moved around his hand, gold light passing across the scars without heat.
Aidan attempted the same thing with his own second construct. His light followed his finger, continued following after the finger stopped and attached itself to Professor Flitwick's left sleeve.
Flitwick looked down at the glowing triangle hanging from his robe.
Aidan lowered his hand.
"I may have omitted the stop condition."
"You may spend the evening writing about it."
Flitwick detached the construct and returned it to Aidan's slate.
By the end of class, Matthew had built four stable light frames of different shapes.
The triangle followed movement.
A small sphere dimmed when covered by a hand.
A narrow ring held position above a page.
The fourth construct changed from gold to red when its anchor thread was cut, though the colour change consumed the remaining charge and caused it to collapse.
Flitwick examined all four.
"You are treating the same charm as four behaviours."
"The charge remains Lumos. The instructions change."
"Exactly."
He tapped the red-collapse design.
"This is the beginning of a signal construct."
"Vermillious could replace the light charge."
"It could."
Matthew opened his notebook.
Flitwick placed one small hand over the page.
"Proposal first."
Matthew looked at him.
"Before lunch?"
"Before practical experimentation."
"That was not my question."
Flitwick smiled.
"Yes, Mr Knight. Before lunch is acceptable."
The library table disappeared beneath diagrams by Tuesday evening.
Madam Pince had permitted Matthew three books.
He had five open around him.
Two were reference volumes which had not technically left their shelves because their chains extended far enough to reach the table.
Madam Pince had noticed.
She had decided not to argue so long as the chains remained untangled.
Hermione's writing filled the linked book beside Matthew's left hand. Elara had drawn a testing table on a wide sheet of parchment. Julian occupied the opposite chair with a book on conditional enchantments propped against a stack of dictionaries. Katie held the revised flying sleeve in her lap but had not looked at it for twenty minutes. Aidan was attempting to make one of the harmless practice frames follow his quill.
It followed the feather instead.
Every time he wrote, the frame tried to sit upon the moving end and blotted the page with light.
"It likes the quill," Katie said.
"It is anchored to movement."
"It is trying to hatch your essay."
Aidan turned the quill upside down.
The construct followed and settled around his fingers.
Julian looked up.
"You anchored it to the fastest-moving part."
"I anchored it to the writing instrument."
"You defined 'instrument' physically rather than functionally."
Aidan stared at him.
"You and Matthew should not be allowed to sit together."
Matthew did not hear the final sentence. He was reading a paragraph concerning intent-sensitive threshold wards.
The book distinguished among four kinds of intent.
Emotional intent described what a person wanted in the broad sense.
Operative intent described the purpose attached to the current action.
Magical intent described the instruction carried by active spellwork.
Declared intent described what a person claimed to be doing.
The author warned that none were identical.
Matthew copied the distinctions.
Hermione responded at once.
Use operative intent for physical action and magical intent for spells.
Agreed.
Declared intent should be recorded but not trusted as the trigger.
Agreed.
Emotional intent should not be part of the construct.
Matthew hesitated.
It may provide warning.
It may also classify frightened, angry or grieving people as threats.
He crossed out the emotional layer.
Katie saw the movement.
"What changed?"
Matthew showed her the four categories.
She read them carefully.
"When I threw the ball for you to catch, I wanted it to reach you. That was operative intent."
"Yes."
"But not harmful intent."
"Yes."
"When Tonks feinted right and touched with the left, the first movement carried misleading visible intent."
"Her committed action remained left."
Katie tapped magical intent.
"What if someone casts a spell that they think is harmless but is not?"
"The construct may read the spell's purpose, not the caster's understanding."
"Would it know the difference?"
"Not always."
Elara added another column to the testing sheet.
UNKNOWN / AMBIGUOUS.
"What happens then?" she asked.
Matthew looked toward the design.
"A shield could release whenever the construct is uncertain."
Julian shook his head.
"That sounds safer until the shield blocks escape, another person's help or a potion being thrown to you."
Katie looked at Matthew's scars.
"Could it block healing magic?"
"Yes."
Aidan's light construct finally left his quill and attached itself to his nose.
He spoke through it.
"Can the shield ask?"
"Not quickly enough," Matthew said.
"Then uncertain cannot mean cast."
Elara looked at him.
"Nor can it mean ignore."
Matthew drew a small secondary symbol.
"Warning only. The construct changes colour when uncertain but does not release Protego."
Hermione's writing appeared.
That gives the wearer information without allowing the construct to decide.
Matthew copied the sentence into the design principles.
A CONSTRUCT MAY SIGNAL UNCERTAINTY. IT MAY NOT INVENT AUTHORITY.
Julian read it.
"That should be permanent."
"It will be."
They turned to the five proposed constructs.
Matthew had named them according to function.
Aidan had renamed all of them.
The first was Lumen Frame, Prototype Three.
Aidan called it the Sun Pebble.
It was not a pebble.
The second was Levitation Carrier, Prototype One.
Aidan called it the Book Butler.
It carried more than books and served no one.
The third was Cushioning Plane, Prototype Two.
Katie called it the Cloud Step.
That name remained because Matthew liked it and refused to explain why.
The fourth was Vermillious Emergency Knot.
Aidan called it the Screaming Ribbon.
It made no sound.
The fifth had no final name.
At the top of its page, Hermione had written:
DELAYED CONDITIONAL PROTEGO CONSTRUCT — PROTOTYPE ZERO
Aidan crossed out the title and wrote:
SHIELD SEED
Hermione's writing appeared beneath it from Dartford.
No.
Katie read the shared public copy of the exchange.
"The waiting shield?"
Matthew looked at her.
She rested her chin on one hand.
"It is a shield that waits."
Julian nodded.
"That is less dramatic and more accurate."
Aidan looked betrayed.
Hermione wrote:
Acceptable as an informal name.
Matthew placed both titles on the page.
Aegis Mora — The Waiting Shield
He had chosen mora for delay after checking three Latin references and arguing with Hermione over whether the case ending was suitable. She had finally accepted it as a project name rather than a complete grammatical sentence.
The construct's diagram occupied an entire page.
An outer ring recognised operative or magical intent directed toward the protected anchor.
A second ring confirmed that an object, body or spell was actually travelling along a threatening path.
A spiral delay line measured approach.
The central shape contained one stored Protego.
A lower release seam angled the shield so incoming force moved down and away rather than returning toward the attacker.
A visible status mark showed whether the construct was dormant, armed, uncertain, degraded or empty.
Aidan looked at the five symbols.
"It needs too many moods."
"It needs visible states," Elara corrected.
"That is what moods are."
"No."
Matthew marked the first library meeting complete only after everyone had signed the observation sheet.
Aidan signed:
Aidan Rookwood — Conceptual Support and Naming
Elara crossed out Naming.
He wrote it again lower down.
Madam Pince arrived just as the Sun Pebble escaped from beneath a book and began orbiting Matthew's head.
She watched it complete one circle.
"No mobile lights in the library."
"It is a controlled construct."
"It is moving."
"I can stop it."
"Do so."
Matthew raised one finger.
The construct stopped.
Madam Pince looked upward.
It remained directly over his head.
"Remove it."
Matthew dissolved the frame.
Darkness returned to the table.
Aidan leaned toward him.
"She fears innovation."
"She protects reading conditions."
"That sounds less interesting."
"It is still true."
The first construct to prove useful was the Cloud Step.
Professor Flitwick supervised the practical test in an empty Charms room. Professor Wardwell attended because the construct involved automatic response to impact, though no shield had yet been included. Tonks came as an older-student observer. Katie, Elara, Aidan and Julian occupied a marked line near the wall.
The Cloud Step appeared as a translucent golden disc no wider than a dinner plate.
Its frame floated two feet above the floor.
The Cushioning Charm rested inside it, quiet and nearly invisible. Rather than remaining active continuously, the construct would release the charm when an object entered the upper detection cone at sufficient speed.
Professor Flitwick held a raw egg above it.
Aidan winced.
"Why are eggs always involved in Charms?"
"They reveal mistakes clearly," Flitwick said.
"They also suffer from them."
"This egg has been duplicated for classroom testing and carries no developing life."
Aidan considered that.
"Better."
Flitwick released it.
The egg fell.
The construct brightened.
A soft golden plane spread beneath it less than a foot before impact. The egg sank into the magical surface, slowed, bounced gently and rolled into Tonks's waiting hand.
Katie clapped once.
Matthew watched the timing marks.
"The charm released too early."
Tonks held up the unbroken egg.
"It worked."
"It spent more charge than necessary."
Wardwell nodded.
"Efficiency matters if the construct must remain active for several tests. Safety matters first."
Matthew adjusted the detection cone.
The second egg fell farther before the plane appeared.
It landed safely.
The third was thrown downward rather than dropped.
The Cloud Step changed from gold to amber, recognised the higher speed and released a thicker cushion. The egg survived, though the magical plane dipped close enough to the floor that Aidan took one involuntary step forward.
"Too late," Elara said.
"By three tenths of a second," Julian added, watching the enchanted timing pendulum.
Matthew narrowed the cone and increased the release rate.
The fourth egg survived cleanly.
Tonks looked toward the construct.
"Would it catch a person?"
"Not this size."
"Could it?"
"With a larger frame and stronger charge."
"Could it catch you from a broom?"
Matthew considered the required force.
"From low height, possibly. At speed, not safely."
Katie looked disappointed.
"We will need a flight version."
Wardwell's scar tightened as her expression became dry.
"You have not completed the floor version."
Katie nodded toward Matthew.
"He understands future expansion."
"That is precisely the concern."
The Sun Pebble proved useful next.
Matthew placed one over the restorative botanical bench in Greenhouse One during a week of low November light. Professor Sprout allowed the test only after confirming the construct produced no heat, drew no magic from the plants and could be extinguished instantly.
The Dittany leaves turned toward it.
The Moly flowers closed.
The Moondew droplets retreated to the undersides of their leaves.
Wiggles—the Wiggentree cutting whose informal name had become impossible to remove from the records—leaned away.
Katie looked around the bench.
"One light. Four different answers."
Matthew dimmed the construct.
The Dittany continued following it until the light dropped below a certain point. The Moly reopened when the gold became softer. Moondew tolerated the faintest setting. Wiggles remained uninterested.
Professor Sprout stood behind them with soil on both gloves.
"What did the construct do wrong?"
"It assumed illumination was equally useful to every plant," Matthew said.
"The light itself is stable," Katie added. "The application is not."
Sprout nodded.
"A good charm may still be poor care."
Matthew separated the construct into two smaller lights. One remained above the Dittany at low intensity. The other moved farther from the Moly and reflected indirectly from a pale board.
Moondew received no artificial light.
Wiggles received ordinary daylight.
The plants settled.
Aidan arrived halfway through the observation carrying a watering can.
He looked at the two lights.
"You have grown suns."
"They are Lumos constructs."
"One is very small."
"The sun is not the size standard for light."
Aidan poured water into the edge of the Dittany pot. The silver stream changed colour, and he stopped before the plant needed to spit it back.
"That lesson remained."
Professor Sprout smiled.
"Occasionally they do."
The Levitation Carrier produced less dignified results.
Its first task was to hold a single book above Matthew while he lay on the floating beanbag.
The ring attached itself to the book correctly.
It lifted.
It rotated the book so the spine faced Matthew and the pages faced the ceiling.
Katie sat beside him, laughing too hard to help.
"The Book Butler has opinions."
"It is preserving the object's natural balance."
"Books are naturally read with the pages visible."
"The spine is heavier."
"Tell the construct that."
Matthew added an orientation mark.
The book turned.
It remained two feet beyond comfortable reading distance.
He altered the anchor.
The book moved too close and pressed the open pages against his glasses.
Aidan watched from the carpet.
"It is feeding you knowledge directly."
Matthew moved the ring backward.
On the fourth attempt, the book hovered at the correct angle.
Katie lay beside him, one shoulder against his left arm, and read the opposite page.
"This is useful."
"Yes."
"We need another one."
"For a second book?"
"For snacks."
Matthew turned his head.
Katie looked entirely serious.
"That is not an academic function."
"Neither is the beanbag."
"The beanbag reduces pressure across my scars."
"It also carries biscuits."
Matthew could not dispute the evidence.
The Vermillious Emergency Knot took the shape of a narrow red ribbon made entirely from light. It could be attached to a sleeve, belt, broom or bag. If the wearer deliberately tore the construct, it released a broad red emergency flare.
The first version activated when Aidan stretched.
The second activated whenever Katie turned too sharply.
The third failed to activate because the tear condition required equal force from both sides, and a person with one injured hand might not be able to produce it.
Matthew replaced the tear with three possible triggers: a deliberate pull, a spoken emergency word or two rapid taps against the anchor mark.
Tonks tested all three while wearing dragon-hide gloves.
The flare rose properly.
Professor Wardwell approved it as a signalling aid, provided no one mistook it for a complete emergency plan.
Aidan asked whether he could attach one to every piece of clothing.
Wardwell said no.
He attached one to his satchel.
That was enough to make him feel prepared.
The Waiting Shield remained.
It was the most difficult because every other construct knew what it was.
The Sun Pebble made light.
The Book Butler lifted.
The Cloud Step softened impact.
The Emergency Knot called for help.
The Waiting Shield had to recognise a condition, delay a response, predict arrival, form a barrier and release force safely.
It had to do all of that without becoming a mind.
Professor Wardwell reserved the Defence classroom for the first shield trial on Thursday evening.
The desks had been moved fully against the walls. Padded targets stood around the practice floor. Three different projectile devices waited in the grooves, each fitted with red training balls of a different weight.
Flitwick arrived carrying a box of diagnostic crystals.
McGonagall attended because the final construct might eventually be incorporated into Matthew's ward-cloth. She stood beside the emergency door with her arms folded, saying nothing while the students arranged themselves.
Tonks wore loose training clothes beneath her Hufflepuff robes. Her hair was dark blue, though one bright pink streak remained above her left ear.
Katie helped Elara place the timing pendulums.
Julian prepared the observation sheet.
Aidan stood near the projectile devices and looked deeply pleased to have been given a position which might involve pressing a lever.
Wardwell noticed.
"You activate nothing until instructed."
His pleasure dimmed.
Matthew stood in the centre of the room.
The Waiting Shield hovered beside his right shoulder.
At rest, it looked like a small eight-pointed star made from thin golden lines. The outer intent ring remained almost invisible. The vector gate curved around the central Protego mark. Between them, the delay spiral wound inward in three complete turns.
A green status point showed that the construct was charged.
Flitwick walked around Matthew slowly, using a diagnostic crystal to examine the structure from several angles.
"Duration?"
"Ninety minutes before the Protego charge falls below reliable first-year strength."
"Number of releases?"
"One."
"Rearming?"
"Manual."
"Maximum distance from the anchor?"
"Three feet."
"Response if the anchor becomes unconscious?"
"The construct remains for twelve seconds, releases only if a confirmed threat crosses, then dissolves and activates the Emergency Knot."
Wardwell's eyes sharpened.
"You linked them."
"Only the failure response."
"What happens if the construct cannot identify the incoming action?"
"The status changes amber. No shield. The wearer receives a warming pulse at the anchor."
McGonagall looked toward the star.
"Why no shield under uncertainty?"
"Because an automatic barrier may block help, escape or harmless contact. The Cloud Step handles accidental physical impact within its limits. The Waiting Shield handles directed hostile action."
"And if the construct is wrong?"
Matthew looked at the central mark.
"Then I still need to defend myself."
Wardwell nodded.
"A tool, not a replacement."
"Yes."
Hermione had written that line in capital letters across the proposal.
Flitwick touched the outer ring with one finger.
"You have kept emotional intent out."
"Yes."
"Declared intent?"
"Recorded during testing. Not trusted."
"Person-based friend or foe recognition?"
"No."
Aidan looked disappointed.
"Why not?" McGonagall asked.
"Because the same person may help in one moment and attack in another. The construct should evaluate the action which touches it, not decide what kind of person someone is."
Wardwell's scar pulled slightly when her expression softened.
"Good."
She stepped into the first casting lane.
"We begin without magic. Miss Bell, stand opposite Mr Knight. You will throw the ball for him to catch."
Katie picked up the lightest red ball.
"Normal throw?"
"Yes."
Katie looked at Matthew.
"Ready?"
"Yes."
She threw.
The ball travelled directly toward his chest.
The Waiting Shield remained green.
Matthew caught the ball with both hands, though the right fingers closed less firmly than the left.
Julian checked the status.
"No activation."
"Why?" Wardwell asked.
"The action was directed toward him," Elara said, "but not with harmful operative intent."
Katie took the ball again.
Wardwell's tone became more serious.
"This time, strike the padded panel over his left shoulder. Do not imagine injury. Your purpose is contact with the protected target."
Katie's expression changed.
She knew the panel would stop the ball. She still disliked the instruction.
Matthew met her eyes.
"Throw properly."
She drew her arm back and released.
The outer ring flashed.
Gold travelled into the delay spiral.
The ball crossed the first distance marker.
The vector gate brightened.
The central Protego mark released immediately.
Too immediately.
The shield appeared between them while the ball was still six feet away. It remained for less than a second, faded, and vanished just before the ball reached Matthew.
He turned his shoulder.
The padded projectile struck the panel and dropped.
Katie winced.
"I am sorry."
"The panel worked."
Wardwell looked toward the construct, now empty and grey.
"The intent gate succeeded. The release clock failed."
"It released when the vector was confirmed rather than when the threat reached the inner boundary," Matthew said.
Flitwick nodded.
"The Protego charge is eager. Your delay spiral did not retain authority once the central charm recognised danger."
Matthew removed the construct and placed it above the diagnostic table.
Aidan picked up another red ball.
"Can I throw one while saying I intend to destroy you?"
"No," Elara said.
Wardwell looked at Matthew.
"It is worth testing declared intent."
Aidan brightened.
He entered the lane, holding the ball gently in both hands.
"I intend to destroy you."
Nothing happened.
The construct remained grey because it had not yet been recharged.
Matthew rebuilt the central charge.
The status changed green.
Aidan repeated the statement with considerably more drama.
"I intend to destroy Matthew Knight and all his unnecessarily complicated furniture."
The construct did nothing.
Aidan rolled the ball slowly along the floor.
The intent ring remained dark.
Wardwell nodded.
"Declared intent rejected."
Aidan looked mildly disappointed.
"Now throw the ball at his foot," she said.
"Hard?"
"Enough to make contact. Not enough to injure him."
Aidan's expression became focused.
He threw.
The ring flashed.
The delay spiral activated.
The vector gate confirmed.
The shield released after the ball had already struck Matthew's boot.
Aidan stared.
"It waited too long."
Matthew looked at the timing pendulum.
"Six tenths of a second after the inner boundary."
Julian read the measurement.
"The spiral counted each loop as time rather than distance."
Flitwick examined the lines.
"You mixed two models. The Futhorc movement mark reads travelled relationship. The Greek spiral reads proportional duration. They are not agreeing about what is being measured."
Matthew frowned at the construct.
"I intended distance."
"Then remove the fixed timing ratio."
Elara leaned over the observation sheet.
"Could the inner ring shorten the delay according to speed?"
"Yes," Matthew said. "The spiral should collapse as the threat approaches."
Katie moved closer to the table.
"Like closing wings."
Matthew redrew the structure.
Three full loops became three flexible arcs. The outermost represented warning distance. The second confirmed approach. The innermost released the shield only when the threat crossed the required point.
The faster the incoming force moved, the faster the relationships collapsed.
Flitwick watched the change.
"That is no longer a clock."
Aidan folded his arms.
"I said that earlier."
"It is a release measure," Matthew said.
Wardwell looked toward the lane.
"Test it."
The next thirty minutes produced eight failures.
The third construct released sideways.
The fourth shielded Katie rather than Matthew because the anchor line had followed the caster's intent back toward its source.
The fifth remained dormant when Tonks threw the ball because her body changed height during the movement and confused the identity-independent vector calculation.
The sixth released properly but reflected the ball directly into Aidan's stomach.
He folded over with a startled grunt.
Matthew cancelled the remaining magic and crossed the floor.
"Are you injured?"
Aidan straightened slowly, both hands over his abdomen.
"My dignity has suffered."
"The ball was padded."
"My dignity was not."
Wardwell waited until he had recovered before addressing Matthew.
"What was wrong?"
"The shield formed perpendicular to the threat."
"That is usually correct."
"It returned the force along its incoming line."
"What should it have done?"
Matthew looked at Aidan.
"Deflected down and away."
He altered the lower release seam.
The seventh construct released correctly but continued pushing the ball downward after it reached the floor, flattening it against the boards until Wardwell cancelled the charm.
The eighth worked.
Tonks stood at the far side of the room with the medium-weight ball balanced in one hand. She had shortened her left arm by two inches and lengthened the right, altering her ordinary throwing structure.
"Ready?"
"Yes."
She feinted with the right shoulder.
The intent ring flickered but did not arm.
Tonks changed weight, stepped left and threw with her shortened arm.
The ring flashed gold.
The outer arcs collapsed.
The vector gate recognised the ball.
The construct waited.
For one narrow fraction of a second, nothing stood between Matthew and impact.
Then the central mark opened.
"Protego."
A gold-and-silver shield formed at an angle before his left side.
The ball struck.
Instead of rebounding toward Tonks or flying across the room, it turned downward, lost speed and rolled toward the empty wall.
The shield vanished.
The construct became grey.
The timing pendulum chimed.
Julian read the measurement twice.
"One tenth of a second before projected contact."
No one spoke immediately.
Matthew looked at the empty construct near his shoulder.
Katie exhaled.
"It waited."
"Yes."
"It waited until the ball actually committed."
"Yes."
Aidan picked up the ball from the wall.
"The Waiting Shield is a better name."
No one reminded him that he had opposed it.
Professor Flitwick examined the remaining lines.
"One successful trial."
Matthew nodded.
"Not mastery."
McGonagall's eyes moved toward him.
"You have learned something."
He remembered her saying the same thing after the needle.
"Yes."
Wardwell took her position in the casting lane.
"Now magic."
The room became quieter.
She raised her wand.
"This will be a low-force training spark. It will sting if it reaches the padded outer tunic. It will not penetrate the cloth or curse scars."
Matthew rebuilt the construct.
The star turned green.
Wardwell lowered her wand without casting.
Nothing happened.
She raised it again, moved as though casting, then stopped.
The intent ring flickered and settled.
"A feint," Katie whispered.
Wardwell turned away.
Matthew's attention followed her.
Her wand moved beneath her opposite arm.
A red spark crossed from the side.
The intent ring flashed.
The vector gate recognised magical purpose rather than physical movement.
The delay arcs collapsed almost instantly.
Protego formed beside Matthew's right shoulder.
The spark struck the shield and travelled downward into the empty floor groove, where it dissolved harmlessly against the warded boards.
Matthew's right hand tightened around his wand.
The construct went grey.
Flitwick's diagnostic crystal sang one clear note.
Wardwell lowered her wand.
"Again."
The next spark came from the front.
The shield caught it.
The third came after a long pause and travelled above Matthew's shoulder toward the wall rather than at him.
The construct remained dormant.
The fourth targeted the outer edge of his ward-cloth.
The shield formed late enough to brush the fabric with warmth before completing.
Matthew made a note.
"Boundary too narrow on the lower right."
"You are compensating around the damaged side," Wardwell said.
"Yes."
"Does the construct inherit your own defensive blind spots?"
He looked at the diagram.
"It was built from my expected body boundary."
"Then it may."
Matthew widened the protected relationship rather than increasing the physical size of the shield. The construct would recognise the full space occupied by the ward-cloth, not only the idealised line of his body.
Wardwell prepared another test.
Before she cast, a loud metallic crack came from above them.
One of the padded training hoops had slipped from its storage hook.
It fell toward Katie.
The Waiting Shield did nothing.
No hostile intent had released the hoop.
Katie looked up too late.
The Cloud Step, left hovering near the diagnostic table, flashed gold.
Its frame expanded.
A cushioning plane opened above Katie's head. The hoop struck, sank into the magic and rolled sideways onto the floor with a harmless thud.
Katie stood beneath the fading construct, eyes wide.
Aidan pointed.
"The shield had a friend."
Flitwick lowered his wand. He had begun casting but had not needed to complete the spell.
Wardwell looked from the fallen hoop to the empty Waiting Shield and the dissolving Cloud Step.
"Why did one respond and not the other?"
"The fall carried dangerous force without hostile intent," Matthew said. "The Waiting Shield was not built for that category."
"And the Cloud Step?"
"It recognised speed, mass and projected impact."
Wardwell nodded.
"You did not make a shield that understands danger."
"No."
"You made one that recognises a defined kind of threat."
"Yes."
"That honesty is why the system worked."
Matthew looked at the two constructs.
One had protected against attack.
The other had protected against accident.
Neither had needed to become judge, enemy register or mind.
McGonagall crossed to the fallen hoop. She examined the storage hook and found that the old screw had cracked through the centre.
"No sabotage," she said.
Aidan looked toward the hoop.
"Would it be inappropriate to call that useful timing?"
"It would be accurate and unhelpful," Elara replied.
"Matthew has taught you well."
Elara stared at him until he looked away.
Professor Flitwick returned the diagnostic crystals to their box.
"The Waiting Shield holds one first-year Protego. Its reliable charge lasts no more than ninety minutes. It will not stop a full curse, heavy impact, sustained spell or attack outside its defined relationship."
Matthew recorded every limit.
"It should not be placed upon another person without explaining what it detects," Wardwell added. "It should not be hidden in a room and allowed to classify everyone entering. It should not be used as proof that an action was criminal merely because the construct reacted."
"The reaction proves only that the conditions were met."
"Good."
McGonagall looked at the star hovering near his shoulder.
"You intend to place this within the ward-cloth."
"Eventually."
"How many?"
Matthew pictured one above each shoulder, one at the ribs, one near the back and several smaller response nodes along the cuffs.
Hermione's earlier notes returned to him.
"One first."
McGonagall's expression suggested she knew the answer had been revised before leaving his mouth.
"That is unusually sensible."
"Hermione is involved."
"Of course she is."
Aidan raised his hand.
"Can I have one?"
"No," Flitwick, Wardwell and McGonagall said together.
He lowered it.
Tonks picked up the medium-weight ball and tossed it gently toward Matthew.
The empty construct did nothing.
He caught the ball.
"Needs recharging," she said.
"Yes."
"That is going to be an important detail during a real fight."
Matthew looked at the grey status point.
"One release should remain visible."
"And you need to practise recognising when it has already spent itself."
He nodded.
Tonks smiled.
"Still a good shield."
Matthew turned the ball between his hands.
"It waited."
"That is what good protection sometimes does."
Snape encountered the Waiting Shield two days later.
Matthew had forgotten he was wearing the inactive frame.
The construct had no Protego charge and therefore posed no danger, but its eight-pointed outline still hovered faintly near his right shoulder while he and Elara entered the Potions classroom.
Snape's eyes fixed upon it before Matthew reached the workstation.
"What is that?"
"A temporary conditional charm construct."
"I inferred that from the magical geometry rather than assuming you had acquired decorative stars."
Several Slytherins looked over.
Cassian Flint leaned toward Lucian Warrington.
Snape's attention remained on Matthew.
"What is the charge?"
"Currently none. When active, one Protego."
"Trigger?"
"Directed hostile operative or magical intent, confirmed by incoming vector and measured release distance."
The classroom became quiet enough to hear the lake water moving beyond the dungeon wall.
Snape set down the ingredient jar he had been carrying.
"Remove it."
Matthew dissolved the frame.
"Because it might react to the lesson?"
"Because conditional defensive magic does not belong beside twenty first-year cauldrons until someone has tested how it interprets knives, heat, ingredient reactions, accidental splashes, thrown bezoars, agitated students and a professor who frequently points a wand at people."
"That is reasonable."
Cassian made a quiet sound of amusement.
Snape turned toward him.
"Mr Flint, if Mr Knight had left the construct active, your habit of reaching toward other students' cauldrons might have made you the first demonstration."
Cassian's amusement vanished.
The lesson concerned a mild Strengthening Solution, though Snape emphasised that it did not create strength from nothing. The potion supported short-term muscular output and magical stamina at the cost of increased fatigue afterward.
Matthew recorded the distinction.
During the brewing process, the powdered salamander scale had to remain suspended above the cauldron for exactly seven seconds before release.
Elara held the spoon.
Matthew counted.
"Now."
She tipped it.
The potion turned from rust-red to dark amber.
Snape passed behind them.
"Why the delay?"
"The base needs to complete the nettle extraction before the scale enters," Elara said.
"And if added early?"
"The strengthening property binds to the inflammation response rather than the stamina base."
Snape looked toward Matthew.
"You are thinking about the shield."
"Yes."
"A potion does not release an ingredient because it detects intent."
"No. But it uses condition before sequence."
"Do not stretch analogies until they tear."
Matthew stirred once counter-clockwise.
"The structure is still useful."
"It may be. Provided you remember that similar timing does not make the mechanisms identical."
At the end of class, Snape stopped beside their completed potion.
"The delayed shield cannot be worn in this room while active."
"I understand."
"Nor may it be attached to potion bottles."
"I had not considered that."
"You have now."
Matthew looked toward the amber solution.
"Yes."
Snape's expression became briefly regretful.
"I should have remained silent."
The first ward-cloth version of the Waiting Shield was sewn into a removable shoulder clasp.
Matthew did not embed it permanently. The clasp attached to the outer layer through four silver-thread loops and could be removed without cutting the tunic. Its physical anchor was a flat piece of dark rowan no larger than two joined fingers. The construct unfolded from it when charged.
Katie helped sew the loops.
Her stitches had improved considerably since she began working on her flight sleeves. They were not as even as Hermione's, but they followed the movement line without tightening the fabric.
"You keep looking at the second loop," Katie said.
"It is slightly higher."
"It needs to be. Your right shoulder sits lower."
Matthew looked at the tunic laid across the table.
She was correct.
He set down the measuring cord.
Katie smiled without looking up.
"You could say it."
"The difference is intentional."
"That is not the same thing."
"You were right."
"Thank you."
They worked at a table near the common-room fire while Aidan and Elara tested the Emergency Knot's durability with increasingly ridiculous movements. Julian had returned to Ravenclaw Tower after lending Matthew a book on temporary anchors.
The beanbag hovered beside the window.
Two Sun Pebbles floated above it, one lighting Katie's work and the other illuminating Matthew's diagrams. The Book Butler held the reference volume open at the required page. A Cloud Step rested inactive near the floor in case the scissors, clasp or ink bottle fell.
Aidan looked around the collection.
"They are becoming a flock."
"They are constructs," Matthew said.
"They move, carry things and need recharging."
"That does not make them animals."
"The Emergency Knot screams for help."
"It releases light."
"The Book Butler follows you."
"It follows the anchor."
"The Sun Pebble sits near your head."
"That is because I placed it there."
Aidan looked toward Katie.
"They are spell pets."
Katie bit the thread cleanly and examined the finished stitch.
"The Waiting Shield is not a pet."
"No," Aidan agreed. "It is a guard dog."
Matthew closed his eyes briefly.
Elara wrote spell pets in the margin of the testing notes.
He looked at her.
"For historical completeness," she said.
The portrait hole opened.
Tonks entered wearing her school robes and carrying a paper bag which smelled strongly of warm biscuits. She handed it to Aidan before he asked, which ensured silence for nearly thirty seconds.
Her gaze travelled across the floating lights, hovering book, folded Cloud Step and dark rowan shoulder clasp.
"You have begun collecting geometry."
"Each one has a function," Katie said.
Tonks pointed at the Book Butler.
"That one holds books."
"And biscuits, theoretically," Katie added.
Matthew looked toward her.
"Theoretically."
She smiled.
Tonks sat on the edge of the beanbag. It recognised her and lowered gently.
"How many tests has the shoulder clasp completed?"
"Twelve physical projectile trials, six magical trials, three feints, four ambiguous approaches and one accidental falling hoop."
"Any curse trials?"
"No."
"Good."
Matthew looked at her.
"You expected me to say yes?"
"I expected you to tell the truth. Those are different things."
She unwrapped a biscuit.
"Have you tried moving quickly while wearing it?"
"Not yet."
"Then morning courtyard."
Katie looked up.
"Can I come?"
Tonks smiled. "Only if you are willing to throw things at him."
Katie's expression became conflicted.
"I am willing to throw padded things."
Aidan swallowed the last of his biscuit.
"I remain available."
"No," everyone said.
The following morning, the Waiting Shield failed during a turning step because the construct lagged behind Matthew's shoulder by four inches. Tonks's padded strike reached him before it corrected.
Matthew adjusted the moving anchor.
It failed again when he dropped into the empty stance because the shield continued protecting the space where his chest had been.
Katie watched from the edge of the mat.
"It thinks you are shaped like a statue."
Matthew looked toward the argumentative statue.
It threw a pebble.
The Waiting Shield detected the intent, confirmed the vector and released.
Gold-and-silver light flashed beside Matthew's face.
The pebble turned downward and struck the mat.
Everyone stared.
The statue slowly hid its remaining pebbles behind its back.
Tonks began laughing.
Matthew looked at the empty construct.
"It worked while I was standing."
"You were also moving," Katie said. "Just not very far."
"The anchor needs body relationship rather than fixed distance."
He changed the four shoulder loops into a dynamic triangle: collarbone, upper back and left hip. The construct's protected shape updated through the relationship among those points.
Tonks tested again.
She feinted high, stepped inside and sent a padded palm toward his ribs.
The intent ring armed.
The vector changed with her step.
The shield unfolded close to Matthew's side and redirected her hand without striking it.
Tonks pulled back.
Her eyes widened.
"I felt almost nothing."
"The shield moved the force rather than stopping your arm completely."
"That is much better than having my wrist thrown backward."
Matthew checked the release line.
"Did it hurt?"
"No. It felt like the air decided I was going somewhere else."
Katie came closer.
"Can it do that on a broom?"
"Not yet."
She sighed.
"Everything interesting is not yet."
Tonks's hair turned pink.
"That is how projects remain alive long enough to become useful."
Hermione received the complete report on Saturday evening.
Matthew lay upon the floating beanbag with the linked book open above him. The Waiting Shield clasp rested on his right shoulder, uncharged. A Sun Pebble hovered over the page. Katie sat beside his left hip, revising her Herbology notes and occasionally taking a biscuit from the bowl held by the Book Butler.
It had finally acquired a second function.
Aidan considered this a personal victory.
Hermione's handwriting filled the page.
The successful shield trigger proves the construct recognised defined magical and operative intent under the tested conditions.
Yes.
It does not prove the construct identifies moral wrongdoing.
No.
It does not prove the action was unlawful.
No.
It does not prove the caster is an enemy.
No.
It does not replace observation, ordinary Protego, movement or judgement.
No.
Katie looked toward the book.
"She is making you say no repeatedly."
"She is establishing limits."
"Are the limits different each time?"
"Yes."
"Then she is right."
Matthew wrote:
Katie says you are right.
The response came quickly.
Katie is frequently sensible when she is not requesting biscuit-carrying enchantments.
Katie looked suspicious.
"What did she say?"
Matthew shared it.
Katie took another biscuit from the hovering bowl.
"Useful enchantments should support ordinary life."
Hermione wrote:
That is unfortunately persuasive.
Matthew smiled.
The informal construct names are now Sun Pebble, Book Butler, Cloud Step, Emergency Knot and Waiting Shield.
Sun Pebble is inaccurate.
Aidan named it.
That explains the problem.
Book Butler carries biscuits now.
The book remained blank for several seconds.
Of course it does.
Matthew turned to the final design question.
The shield currently responds only once. I am considering a chain of three constructs along the ward-cloth.
Hermione's answer arrived before he finished the sentence.
No.
Matthew looked at the word.
Katie glanced over.
"That was decisive."
Matthew wrote:
Explain.
Three constructs may interfere with one another's intent fields. The first release will alter the vector seen by the second. The second may interpret the first shield's redirected force as a new incoming action. You could create a cascade.
Matthew pictured three shields opening in sequence, each reacting to the last.
That was unpleasantly plausible.
One active construct. Additional anchors may remain empty.
Agreed.
A smaller sentence followed.
Eventually, one construct may hold multiple shield charges if the frame can distinguish them.
That is more difficult.
Yes.
You still want to help build it.
Obviously.
Katie rested her head briefly against Matthew's shoulder while reading her own notes. She was careful to choose the left.
Matthew looked down at her hair, then back at Hermione's writing.
Katie says the shield waits until someone actually commits to the action.
That is its best feature.
Why?
Hermione took longer to answer.
Because people are allowed to be angry, frightened, jealous, confused or wrong inside their own heads. Protection should answer what they choose to do with it.
Matthew read the sentence twice.
Katie noticed his stillness.
"What?"
He read Hermione's answer aloud.
Katie's expression softened.
"Yes," she said. "That."
Matthew added the sentence to the permanent design principles.
A SHIELD SHOULD ANSWER COMMITTED HARM, NOT PUNISH UNCHOSEN THOUGHT.
The linked page warmed.
Hermione had underlined it from her side.
Later that night, Matthew carried the clasp into the private study compartment of his trunk.
Samuel, Eleanor and Gareth examined the design through their portraits. The Study Leaf lay open beneath it.
Gareth's first response was predictable.
"How strong?"
"First-year Protego."
"Can it hold a curse?"
"Not a serious one."
"Can you make it stronger?"
"Eventually."
Gareth looked satisfied by the final word.
Eleanor examined the intent structure.
"What happens if someone throws a healing potion at you?"
"No hostile operative intent. No release."
"What if someone believes the potion is healing but it contains poison?"
"The construct may not identify that. It does not analyse ingredients."
"What if an enemy throws a harmless object with the intent to distract?"
"It may arm and release if the object's projected force crosses the threshold."
"Then the shield may be wasted."
"Yes."
"What happens afterward?"
"The status turns grey. I know it is empty."
Samuel studied the lower release seam.
"You direct force down and away."
"Yes."
"Could the ground return it?"
"At high strength, possibly. The current version cannot safely handle that magnitude."
Samuel nodded.
"You know what it does."
"Yes."
"You know what it does not do."
"Yes."
"You have not called it intelligent."
"No."
The Study Leaf began writing.
CONSTRUCTIVE CHARM FOUNDATION DEMONSTRATED.
A second line formed beneath it.
A CONSTRUCT MAY PERFORM A DEFINED JUDGEMENT OF CONDITIONS. IT MUST NOT BE MISTAKEN FOR JUDGEMENT OF PERSONS.
A third followed.
DELAY IS NOT FAILURE WHEN DELAY PRESERVES ACCURACY.
Matthew looked at the last sentence.
For most of his life, waiting had meant helplessness.
Waiting for pain to pass.
Waiting for adults to answer.
Waiting for memories to return.
Waiting for the Ministry to admit what its own records lacked.
The Waiting Shield used delay differently.
It did not hesitate because it was afraid.
It waited because acting too soon would answer a feint, a possibility or a thought that had not yet become harm.
It watched the outer line.
It confirmed the path.
Then, only when the action crossed the defined point, it became what it had been built to become.
A shield.
Matthew returned to the dormitory with the dark rowan clasp in his hand.
The other boys were asleep. Aidan had left the Emergency Knot attached to the side of his bed, though Matthew noticed he had placed a shoe beneath it to prevent accidental activation. That showed unusual foresight.
Matthew climbed into bed and set the Waiting Shield clasp upon the small table beside him.
He did not charge it.
A spell that could react while he slept required testing they had not yet performed.
Instead, he opened the linked book one final time.
Hermione's message waited.
Have the portraits reviewed it?
Yes. The Grimoire accepted the constructive charm foundation.
What did it say?
Matthew copied the three lines.
Hermione responded to the final one.
Delay is not failure when delay preserves accuracy.
Yes.
You like that.
Matthew looked toward the clasp.
I am learning to.
A pause followed.
Does it have a proper name yet?
Aegis Mora.
The project name remains grammatically questionable.
The Waiting Shield.
Better.
Matthew closed the book.
Beyond the bed curtains, Hogwarts shifted through the night. Pipes clicked. Wind moved around the tower. Somewhere below, portraits crossed between frames and suits of armour exchanged pieces of gossip they would deny possessing by morning.
The dark rowan clasp remained still beside the bed.
When charged, it would unfold into a small golden star and wait near Matthew's shoulder. It would not decide who was good. It would not decide who was guilty. It would not treat anger as attack or uncertainty as permission.
It knew one narrow piece of magic.
When directed harm became action, when purpose gained a path and the path crossed the final line, the construct would release what Matthew had placed inside it.
Not punishment.
Not revenge.
Protego.
A shield that waited until waiting was no longer the right thing to do.