Prior to the epilogue, Kelly breaks his left arm and is shown with it in a sling and bandaged. The epilogue, which takes place soon after, shows him with his arm in perfect working order and no indication of an injury.
After Kelly shoots the two Chinese agents in the alleyway, Scott says "We better get Elroy, fast", and he and Kelly turn and run back down the stairs. At that point one of the "dead" agents lying in the alleyway raises his arm as if to push himself up off the ground, evidently thinking the scene was over.