What a tool.
Ulfric's challenge was perfectly lawful, and a demonstration of both courage and strategic acumen. He could have been arrested and tortured again. Instead, he put Torygg into checkmate. So who's the better king really? As I've always said, his use of the thu'um in the duel was more about calling Nords to their native strength than winning the duel. Something they would need to fight against the Thalmor.
I only wish they had shown in the game that Ulfric intends to teach others the thu'um after he wins.
I think it's hilarious that he argues simultaneously that the duel was unfair because Torygg couldn't possibly win it, and that Ulfric was afraid to fight him. Reminds me of the nuttier anti-Trump people who simultaneously say he's a mentally defective imbecile and that he's an evil genius. You know what time it is when people start arguing like that.