That was seriously brilliant! I figured she was counting cracks in the floor. Luna is a true Ravenclaw for sure. You know the whole; wit before whatever stuff. She knows things that she doesn't even know she knows. It's just there for whenever the occasion calls for it.
Neville is sure in a bad way. Is it to the Room of Requirements for them now? I know Snape is s'pose to be a good guy, but, sometimes I think he enjoys going along to protect his cover.
This was such a great post, and I can't wait to read more. You are an exceptional writer.