In the script, the worker who died a gruesome death wasn't killed by being pulled into the machine, but was crushed to death by a heavy object. After death, his resentment lingered, transforming him into a fierce ghost that ignited a fire.
The ghost used the fire to trap the workers, and then the fierce ghost appeared, killing the workers one by one until only one survived.
The last survivor was very clever, realizing that the ghost found and killed the workers hiding in dark, concealed places first. So he decided to gamble, mustering the courage to stand in the most conspicuous open area, and it proved to be the right decision. He thus narrowly survived.
At the same time, Yang Xiao thought of that Source Ghost, which seemed to fit the description of being crushed to death, with all bones shattered and the skull cracked.
All clues pointed to the actor playing the Source Ghost, and Yang Xiao found his name at the end of the script: Zhuang Xiaowu.
Finally... found it!!
