The Dragon shout is in fact an arcane form of magic. While the Nords consider it something else, it's still, like I said akin to using a flashbang in a sword duel.
So if the High King was so unfit, weak and unworthy to rule why bother using it? Ulfric is a fool with double standards, and I don't have to be an Empire bootlicker to see it.
At least, that's what my character thinks from RP point of view, haha. :hubbahubba:
I agree, it's sort of a [censored] move. But if I remember right, the primary sources seemed to all say he shouted at the ground to make a point, but never used his voice aggressively. One might call it some Miyamoto Musashi style psychological trick, but in the end, the whole fight WAS sword to sword, with nothing magical to the combat itself.
Still, I'm not sure taking the magic out really makes the fight any more fair. There's something to be said about a man who challenges another (a friend, no less) to a duel knowing full well there's no way he can lose. I'm sure if Ulfric made a mistake, and thought he was about to die, he'd of Thoomed the High King into a bloody pulp and never looked back. It's no wonder most of Skyrim views this more as a murder instead of a fair duel.