It's a tough battle, but I think that Nick wins. He has a history of completely demolishing all that is innocent. But lets give the Ace credit - his religious preachings will whittle down Nick's desire to fight in the first place*.
*Note: I have no clue which religion Kams belongs to but I can only assume that, in the arena, he succumbs to the realization that he will soon be facing the wrath of the almighty at the hands of Nick, and, therefore, becomes religious.
Next battle: Cobra vs. Pyro