i agree with chief. if you have marks on your forearm from a crossface that is a completely different issue. that is just accidental contact with the teeth. intent is the key issue. drawing blood would definately be a good place to start at. anything else intent is real hard to prove because of the nature of wrestling an the contact that it brings. case by case is about the only way you can rule on this. just like anything else in wrestling, it is real hard to state exactly how something should be ruled.