Disguise? Camouflage?
A better term should be cellular replication.
Possessing the actor's quality and the root of evil cancer, William could easily acquire and rapidly replicate others' cells to physically transform into their appearance.
Not only that, he could implant cancer cells into others' bodies, inducing them to change into his form.
Before leaving the theater, William had already swapped identities with Lene.
Through his investigation of the Fourth Disaster, external contact, and viewing of the current primordial videotape's content, he could roughly deduce the essence of the Fourth Disaster, clearly understanding that Lene would be a good 'bait.'
Sure enough, the other party took the bait.
But it had only bitten onto the bait,
Dragging the whole big fish out of the water and into the fish bucket required sufficient skill and operation, as this fish bore the mark of the Fourth Disaster.
...
Being caught peeping was taboo,
