Coach,

I heard about your situation from the official who was working on that mat. Under the circumstances he told you the truth. If he actually didn't see the bite happen, there is limits to what he can do. Many times a wrestler is crossfaced very hard and their forearm goes into the opponents teeth. However if the skin is broken that is a good indication the bite was flagrant in which case they can be ejected. The best thing you can do hope that he does get caught at some point and maybe he will learn his lessons.