The right-arm-only "hit" at :37 thru :50 with the stick doesn't appear to me to be a Hit at all, because he isn't extending the right hand through impact with the right triceps. That is just a left arm Swing with the left arm detached. The "whap" is supplied with the driving right shoulder, not the right triceps - note that the right arm bend is constant from address to the top and back to impact, so the right arm is not straightening as it must if the right triceps is employed.