"Staked me to the ground with swords..." he says like a vague complaint, maybe as a rebuttal to the accusation that Seth didn't fuck him up too bad.

It isn't really a complaint, though. Sure, it's an expression of the fact that being impaled wasn't fun, but it's also just the first step in a wandering train of thought that goes farther than that. He's thinking about the course of the fight, and about how Seth is going to feel pretty bad tomorrow when he can't heal.

Finally, there's the sound of his hand flopping down onto the blankets next to him in a surprisingly emotive gesture.

"...I have a boss I can stab."

So, Seth isn't the only one who's grateful for the gratuitous violence.