Wow, you really don't like the sound of that. It's some sort of horrible screeching, but now that you've walked into the hallway, you realize it's coming from both in front of and behind you. There are no doors. There's no way to escape. You can do nothing but watch as the most horrifying thing you've ever seen turns the corner at the end of the hall, baring its canines with a leer and reaching out for you with clawed fingers.