This happened to my son last year. He was wrestling 12U and was bitten so hard that although it didn't draw blood he had a mark for a week from the bite. I took a picture of it a week later and you could still see where he had been bitten. All it did to my son was to fire him up. He pinned the kid within 10 seconds of being bitten. We asked our coach what he should have done and the coach said that if it happened again, my son should tell the ref. We then talked to the other kid's coach and showed him the bite mark on my son's arm. He said he would talk to his wrestler. I hope he did, because we have a great sport and like I tell my boys, "If you have to cheat to win, then the win really isn't yours."