It's clear that the ghost is aware of what's happening to his body, but he doesn't know how to tell if it's real or not. He's worried that if he stabs the ghost's heart, it'll affect his real body.
It's clear that the ghost is aware of what's happening to his body, but he doesn't know how to tell if it's real or not. He's worried that if he stabs the ghost's heart, it'll affect his real body.