-Ahahahaha, I love how all 4 prefects gang up on you. One keeps walking into the others. Excellent.
-"I'm sure there's someone around here!" I doubt it's the kid you just caught five times in a row.
-Denmark laughed from the other room when you asked why Hogwarts, A History was in the Restricted Section.
-When you nearly fell off the ledge I audibly gasped.

Every time you hit the bookshelf with Flipendo it goes backwards some. Maybe you're supposed to get it to the block and...I dunno, tackle it?