In the part where the ghost appears and goes into the room in the dark hallway, enter that room and go back into the shower. The ghost will appear by the back wall. If you shoot it, blood with splatter on the wall. If you missed him the first
time, just leave the room then return and he will reappear. You can do this as many times as desired. When you shoot him, it will seem as if time slowed down and speeds back up.