I assume that it opens Rilla up to a hook with the right to the ribs. Stepping in with the hind foot for an uppercut generates a lot of momentum, as you push forth both the weight of your whole torso and your leg. This would delay Dyayun's recovery. Tre'yan, however, will be quick to sidestep with his right foot, lean away from or block the uppercut and attack, his initial strike carrying minimal burden.