You pull your elbow close to your body as you dip down, pushing the full weight of your hips into a right hook. Your punch collides solidly with the primates rib cage, and you can feel his bones start to give. He staggers for a moment and the whole group falls back, but the leader is already readying his next attack. He's crouched and about to lunge at you, likely aiming either high or low, judging by his stance.