Although his hand was screaming with pain and he was gasping for breath in an attempt to keep himself sane (relatively speaking), Caim almost forgot everything when Farfarello spoke again. The insult behind those words (whether it was there or not - he read too deeply into such simple statements sometimes) enraged him despite the pain and despite the helplessness of his situation.

He snapped at Farfarello, jaws closing over a foot away from the demon bastard's face, but still tried to rip him apart. You dare call me useless! It was a sacrifice, and one I was willing to make! You could NEVER have come close, you hellborn bastard!