Oh my, This should prove to be very interesting. As A previous reviewer said the ending was worth the wait. It started with "Hermione was right. Wizards have no logic." and from then on it was one big put down of Dumbledore.
There were only a few things that could have made it better. Ron defending Dumbledore and getting slapped down at the same time springs to mind.
One of the main reasons I read fan fiction is for scenes like this.
Well, you knew Dumbledore would try that line sooner or later. . . .