At night in the Rooster Crow Temple, Wang Linchi disguised himself as a Headless ghost.
When he entered, the Headless ghosts seemed somewhat uneasy. Still, in the end, they couldn't distinguish Wang Linchi from themselves, and as a result, they didn't take any action.
Headless ghosts weren't as intelligent as other Demons and apparitions. After losing their heads and becoming revived corpses, the Headless ghosts could only act on instinct. Furthermore, without sight, hearing, smell, or taste, they had no way to receive external information and could only rely on certain force fields within the Rooster Crow Temple to receive messages.
In other words, once they left the Rooster Crow Temple, Headless ghosts lost their "signal" and therefore could only exist within the temple.
As for what specific force field it was, Wang Linchi hadn't been able to find out yet, though he could faintly perceive some traces.
