Yeah, I killed him now. But it's rather frustrating that I have to start the combat again five times in order to kill him. Additionally, he's got shitloads of HP - I'm not sure how much (I don't have Awareness), but more than 200 for sure. A challenge, yes, but still it's a bit annoying.
These encounters need some work - the whole thing breakes when he gets knocked out. I didn't want to kill him (heard there's non-violent way to finish this), but this way I have no choice (I knock him out almost all the time).