i, personally, liked the fact that it was expelliarmus. That's Harry's trademark spell, really, isn't it? And the fact that he killed without killing was good.

But (and I bet you saw that coming) there wasn't really a Duel. They didn't fight at all. Just... circled.

Don't get me wrong, circles are good, but I would have preferred some action, like the other duels.

But, I liked it, the atmosphere JK wrote was just... superb.