When his shoulder gives in to Merrick's attempt, Cade makes a sound like a kicked dog, a yelp of unfamiliar agony. He's certainly been injured before, but never with quite so much... deliberation. A calculated effort, not the heat of combat.
Suddenly giving way to the frenzy he's been trying to hold back, he reaches behind him with the uninjured arm to grasp the elf's ankle. He wrenches his grip outward and away from himself, intending to catch Merrick off-balance long enough to get up and gain the upper hand. Never mind that his right arm is now almost entirely useless; that sort of thing usually doesn't stop him when he's fighting for his life.