Yea, that's Peter Bonet. He's pretty good. Cama, from my understanding, doesn't really teach fswc any more. He's real heavy with his s. mantis. Bonet got disqualified from that tournament for kicking a dude in the throat. I don't really like his style too much. Too flashy. Nick's chi sao and forms i think are my favourite. Same competition as the one you linked up there.
When caught between the ribs, the receiver will notice immediate contact. It's really good for shots to the face where knockout points are. Pressure points along the arms are great to attack with this fist in a chi sao. I always add them to my punching rounds. But unlike in that picture I have my thumbs supporting my extended knuckle. Focuses the energy, in my opinion, better.
I am no sifu.