I'm just backing up ADM on this, the birdie scene is in the right place, but Doctor M has a good point about where you placed the commonroom scene, harry doesn't yet have the motivation to kil him, the only thing he has heard is Snape's "what about Potter? should he be warned?" which isn't motivation enough.

I haven't actually seen your potter edits yet ADM, but I followed this thread closely when you were making them, I'm now working on and extended Azkaban which puts the scenes back in the intended script order, I would love to see your edits though.