"I suppose you've noticed, there ain't no doors, only the hole. This is an oubliette. The Labyrinth's full of 'em."
"Really. I didn't know that."
"Oh don't sound so smart. You don't even know what an oubliette is."
"Do you?"
"Yes. It's a place you put people to forget about them."

Whoops! You weren't very cautious after that door, and ended up . . . in the oubliette. Why didn't you use those helping hands? Oh well. Now you've got the worst, and only, option. To trust and follow Hogwart! Remember, you can't go back . . . unless you cheat, that is.