First, I want to let everybody know that I am a noob when it comes to Gracie JJ. I started rolling 4 months ago and I am a bonafide-certafide bottom of the barrel white belt. I was in class on Thursday. I was rolling with one of the assistant instructors (a brown belt). He was having his way with me, as expected. I tapped 3 times in 5 minutes. On the fourth go around he was paying more attention to the other guys rolling than to what he was doing with me. I managed to pull guard. Then he droped a nasty elbow that chipped a tooth and lacerated my lower lip. I wound up going to the ER to get 4 stiches and then to the dentist who told me that it would cost $ 1,250 to get a crown. I forked over the money. The guy saw that my mouth was bleeding and did not even offer an apology or even say that it was an accident. My question to you guys. Is this excusable? It is understood that while rolling there is to be no striking of any kind, no leg/foot locks and no neck cranks. I know that there will be injuries but I never expected this. What bothers me most is that he is an assistant instructor. Your thoughts fellas. BTW please feel free to include any injuries that you have suffered that you feel should have been prevented.