I think he wanted Rigo to pay for landing a legitimately powerful shot like that. By acting knocked out though, that is just causing the fight to be stopped
So the poor guy was acting after the savage shoot, are you blind? lets give some credit to him for daring to face Rigo when the rest are still running. The fight won't help Rigo on the contrary every body is on notice.
He definitely pretended to be KO'd...he felt Rigo's power and figured it would be easier to just lay there and hope for the best