The idea is that as long as the ghosts make a mistake, he can take action in a manner that fits the rules.
"Want to go somewhere isolated and play a game with me? It's really fun." Gu Shanhai acted like a creepy old man, patting the ghost's head, giving the impression that he might twist it off.
"But I have chores to do, so I'm currently busy." The ghost's survival instinct was strong, so it refused without hesitation, though it'd be better if it weren't trembling so much.
Gu Shanhai's words also expressed his rule for killing ghosts, which involved being alone with the target.
Next up was Shura, who also indirectly conveyed his ghost-killing rules. He could only act if the ghost wasn't sleeping in the room at night.
They couldn't directly state their rules, but if their teammates figured them out, it would be another matter because what they said wasn't illogical.
"Alright then, go ahead and finish your chores, we can play later." Gu Shanhai showed a sinister smile.
