I am at a place in the middle of the game and I'm stuck! My task is to get a book from the forbidden library(it's like Hogwarts something II or Volume II...I dunno) [[or whatever it's called]] to bring back to Hermione...Now I have snuck past the prefects, into the library, with all of the ghosts and stuff, but my problem is, the door is either blocked by some kind of slime stuff, or this blue glowing rock thing...I don't know where to go...please help?