First off, there is not necessarily any correlation between being in the USMC and being a great fist fighter other than the fact that they are generally in great physical condition and mentally tough. There are millions of tough guys who are not in the Marines and there are plenty of Marines who are brave and great war fighters but not big physical brutes.
As for that encounter, the big guy seemed to be connecting pretty well to me, his punches were all landing. The black kid might not have been tough at all and we don't even know the genesis of the fight from that video. Typical internet garbage.
