The other night (about a week and a half ago) at training my friend was rolling with one of our partners got cauight in a kimura and we ended up hearing his arm pop. We thought is was most likely a tendon issue. After waiting for it to heal on it's own for almost he week he finally went to the doctor and found out his arm was litterally broken in to 2 pieces. with some slight nerve and tendon damage. He understands that he should've tapped sooner, but i'm thinking for rolling the kid might've been going to hard. I mean, if a shoulder injury would've occured no big deal, but the kid wasw pushing hard enough to break my friend's arm over his forearm. Have you guys ever heard of any injury like that from a kimura?? What are your thoughts?