Notice the wet spot in front of his crotch...Pac's a sado masochist, he likes dishing out and getting pain, I think he jizzed himself...
everytime pac throws his accumulation of punches, he moves laterally to the right. the best way to counter this is to step to the right when pac attacks and throw a counter right hook to the body. this should be effective enough to put pac at bay when he attacks.
I noticed that he was only moving one way, and kept check stepping. Probably because it was an open workout and just wanted to look good rather than technically solid, i mean he was throwing his punches from his chest and not his chin. I doubt Mosely has a chance.