I wonder if a Pensieve would help. If we had one, I mean to say. You could watch a number of your memories of fighting him and see if you notice anything particular about his technique. Though I suppose it doesn't matter as we haven't got one.

I say, what about Draco's omnioculars? He isn't going to be using them in the Elysian. Poor chap, we're forever borrowing all his best gadgets, what, but he's a decent sport about it. Perhaps you could get new recordings of him, or there might be old footage Draco hasn't erased yet. Might objective analysis help remove your own doubts from the equation?

-J