Rumina Sato is the guy in the blue shorts and he is ‘eating up’ his competitors in this video. I posted another one of his videos earlier in my blog where he ripped through about 10 unsuspecting grapplers in a tournament. None lasted more than a minute. I don’t know if they knew who he was or not. There’s no sound in the second one, but the action speaks for itself!
Sorry about that,- last sentence.