Brilliant work, as always. I'm amazed at how seamlessly you've been able to diverge from canon and stay somewhat close to it at the same time. Every AU writer around can learn something from your work. Using Neville makes sense, but it eliminates my original theory (as soon as Luna dropped the paper in, for the record) that the fake Moody put her under the Imperius. That would only work if Neville was seen as the Boy-Who-Lived, though, if you follow me. I took a few leaps there, so I have to apologize for this rambling discourse.
Seriously, though, excellent chapter.