Kakashi initially didn't want to pick up his father's sword technique again, focusing only on mastering this Sharingan as quickly as possible.
However, Kakashi soon discovered during sparring with Uchiha En that Uchiha En's fighting style, when combined with the Sharingan, primarily utilized Taijutsu, or rather, a strange type of sword technique.
After being knocked back by Uchiha En countless times, Kakashi finally couldn't help but ask, "En, why don't you use the Sharingan's other abilities, only its dynamic vision?"
"Because I believe the core ability of the Sharingan is dynamic vision. Starting from the Single Tomoe Sharingan, dynamic vision is enhanced with every evolution, reaching an incredible level when it becomes the Three-Tomoe Sharingan.
Such powerful dynamic vision is extremely helpful for Taijutsu, allowing you to easily see through an enemy's attacks and counter them.
Kakashi, your Taijutsu foundation is good, and I remember you should have an inherited sword technique! You can learn my fighting style, combining your inherited sword technique with the Sharingan's dynamic vision; only then can you maximize the power of this Sharingan."
After hearing Uchiha En's words, Kakashi fell into deep thought.
After a moment, Kakashi said, "Thank you, En. I will seriously consider your suggestion."
Uchiha En nodded and said nothing more.
A hint is enough for some matters; too much is as bad as not enough.
The next day, when Uchiha En saw Kakashi again, he was carrying a short sword capable of conducting Chakra.
After that, Uchiha En spent the entire day sparring with Kakashi using only Taijutsu.
Through this day of "exchange," Uchiha En basically figured out the principle behind the Hatake clan's sword technique.
To put it plainly, the Hatake clan's sword technique is not just simple swordsmanship; it is a type of Nin-Taijutsu.
The Hatake clan's Nin-Taijutsu relies on using Lightning Release to stimulate cell activity, greatly increasing speed, and attaching Lightning Release to a short sword crafted from Chakra-conducting metal, making the body and sword one.
This type of Nin-Taijutsu is remarkably similar to the Lightning Release Chakra Mode.
However, the Hatake clan's Nin-Taijutsu lacks the defensive power of the Lightning Release Chakra Mode and is somewhat inferior in speed, but its offensive power surpasses that of the Lightning Release Chakra Mode when Hell Stab is not used.
"En, you were right. I feel that combining the Sharingan's dynamic vision with my inherited sword technique yields excellent results—it feels exactly like when I used the Sharingan to perfect the Chidori back then."
"Chidori? What is that?" Uchiha En asked, feigning ignorance.
"Chidori is a Ninjutsu I created myself. I'll demonstrate it for you!"
With that, Kakashi formed hand seals. Seeing this, Uchiha En immediately activated his Sharingan.
Under the observation of the Sharingan, Uchiha En noticed that as Kakashi formed the seals, a mass of Lightning Release Chakra first adhered to his palm. This Lightning Release Chakra on Kakashi's hand stabilized after the seals were completed. The moment the technique formed, it sounded like a thousand birds chirping, startling the birds in the forest.
As the only self-created Ninjutsu by Copy Ninja Kakashi in the original work, the Chidori can be considered the Ninjutsu counterpart to the Rasengan in the early to middle stages.
After Sasuke learned the Chidori, he used Lightning Release shape transformation to develop advanced Ninjutsu such as Chidori Sharp Spear, Chidori Stream, and Chidori Blade.
However, there was one thing Uchiha En never quite understood: the original work clearly stated that Chidori was developed for assassination, but how could one assassinate someone when the technique made such a huge noise?
Could it be an "assassination" that involves killing everyone who witnesses the technique?
While Uchiha En was idly pondering, Kakashi activated his Sharingan and sped toward a distant rock.
Following a crisp "crack~," the rock was easily shattered.
After watching Kakashi demonstrate the Chidori, Uchiha En thought to himself, "The technique's genuine weakness has indeed been compensated for by the Sharingan."
"En, what do you think of my technique?" Kakashi asked Uchiha En.
"It looks very good in all aspects. If I'm not mistaken, this technique combines both Chakra nature transformation and shape transformation.
Concentrating high-intensity electrical currents formed from Lightning Release Chakra onto your hand and using the speed of a thrust to pierce the target—it's a very ingenious idea."
Upon hearing Uchiha En's exaggerated praise, Kakashi scratched his head, feeling a little embarrassed.
"Kakashi, since you incorporated both shape transformation and nature transformation into this technique from the start, I feel this technique should have some other avenues for development, such as—"
Uchiha En began telling Kakashi about the various extensions Sasuke developed for the Chidori in the original work. As Uchiha En explained, Kakashi's eyes grew brighter and brighter.
"En, your ideas are fantastic! If all these ideas can be realized, the Chidori could be applied to combat in various scenarios."
"Then work hard from now on! Focus your energy on combining swordsmanship and the Sharingan while simultaneously developing Derivative Ninjutsu for the Chidori."
"En, you came up with these ideas; I can't hog them all! How about this: I'll teach you the Chidori, and once you learn it, we can develop it together."
Upon hearing this, the corner of Uchiha En's mouth curled up slightly. His goal had been completely achieved.
For the next half month, Uchiha En focused his energy on learning the Rasengan and the Chidori.
With Kakashi as a sparring partner, Uchiha En's progress was rapid. Within half a month, he had mastered the most basic Rasengan and Chidori.
Kakashi certainly lived up to his genius reputation; in just half a month, he completed the first Derivative Ninjutsu of the Chidori—the Chidori Blade.
The Chidori Blade technique involves injecting Lightning nature Chakra into the blade to enhance the weapon's lethality. Opponents struck by it are paralyzed and unable to move. Since the technique itself possesses the characteristics of the Chidori, it is named Chidori Blade.
After using the Chidori Blade, the Chakra-conducting short sword could easily cut through even steel.
If Kakashi's short sword could easily split rocks, Uchiha En's nodachi would be even more capable.
It is worth mentioning that when Kakashi used the Chidori Blade, the blade color was blue, the same color Sasuke's Chidori Blade was initially.
However, when Uchiha En used the Chidori Blade, the blade color was slightly purple, which puzzled Uchiha En.
But he didn't pay it much mind; it was just a difference in color, a minor issue.
That afternoon, while Uchiha En and Kakashi were developing Derivative Ninjutsu for the Chidori, Minato Namikaze suddenly appeared before them.
His expression was grave, indicating that something serious had happened.
"Minato-senpai, what's wrong? Has the war situation changed?" Uchiha En asked.
"Yes. Hokage-sama just received news that the Sand Ninja are currently assembling near Mount Kikyo. A major battle between the two Villages is likely about to break out."
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