Crystal palace monster.
You know the scene where he fights the monster and this monster is beating the shit out of him and then Conan breaks a mirror by accident and figures out what he has to do? And then the fight was immediately over.
It was exactly the same with Stipe and DC. The moment Stipe figured out he has to hit DC in the body, it was immediately over.
I can't recall any other fight where the flow of the fight changes so quickly. If Stipe hadn't figure it out, DC would've walked to a pretty easy decision victory.