Krogan usually fought as much with their head as their fists--literally. A drawn out fight between two krogan involved headbutting with the heavy plates on the top of their heads. Of course, he was just as good with his shotgun, but he wasn't trying to kill the pyjak. Shepard would probably bitch him out if he did that.
He shoved the blade aside with his armored arm, metal screeching against hardened plastic. His other hand went flying towards his face.