Yeah, but we made mistakes of our own. We didn't follow an optimal turn order so he had more opportunities to hit us.
Even so. Not a failing of his strategy. His strategy worked. He didn't have enough punch behind his punches. A blitzdown is an appallingly straightforward and effective strategy against a very broad range of opponents, and he has an item to deal with the normally shitty sustain of a blitzdown.
Looking at him in completeness now(I assume he pulled every card he had):
-Why didn't he use his Domain Weapon in earlier rounds? He didn't need it. While its a fine defensive domain weapon, its true purpose is a second wind health and qi recovery item, which basically nobody would expect.
-Why was his defense comparatively shitty and we keep seeing him get hit? Because he had his Domain Weapon, it was in his favor for opponents to act unknowing of that, trading blows until he pops the recovery if he loses the blow exchange.
-Why didn't he have any AoEs? Because his strategy is predicated upon punching out the primary target and then blazing it out of there.
-Why is his weapon fists? Because his weapon is brass knuckles, which means he skips the "equip weapon" phase, he immediately can attack. I suspect this ties into one of his arts to activate an out-of-initiative sequence Boomleap attack.
He invested basically everything into striking first, being impossible to disengage with, and simply destroying your face with debuffing hits before your buffs could go up. He's basically a living missile, you fire him at a target, he takes it down...and then he goes down because he's empty of ammo.
Its a weirdly specific build because its mostly useful in a tournament scenario.