lovely, lovely chapter! I laughed about the DADA antics. Oh man, Lockhart is very ridiculous and very entertaining. Of course only the boys notice. XD

This part needs to be structured better in it's direction, time:

The candelabra Neville was hanging from suddenly disintegrated, and he plunged through the air, landing directly on Lockhart.

The Gryffindor boys waited until they were a safe distance out of the room, then Harry and Dean hoisted Neville onto their shoulders and carried him to the Great Hall, cheering.

Professor McGonagall gave them detention for foolhardiness, of course, but Harry thought it was worth it until he showed up to the Great Hall Friday night to find out where he was headed.

You switched a little too quick and left your readers behind both times. I really, really liked the detention scene with Snape and the diagnostic potion that lit things up. I loved their conversation and how Snape told him that “A wizard who pulls back on a promise is a very poor wizard indeed.” Great line. Great job on all their interactions! Thanks so much for sharing!!