There’s no doubt Farah gave JM a facial with his forearm. Although against the rules that is generally accepted within the game and happens numerous times a very match.
I suppose the real question is whether Farah pushed his arm into JM’s mouth causing the tooth imprint (which was clearly visible on telly) or whether JM chomped. Unfortunately I think it was the latter, mitigating circumstances or not in RL biting is one of those sins similar to gouging which rightfully gets a long ban. I don’t expect to see him again in the WC.
So, the question now is who replaces him? I assume we can’t call up a reserve winger so it has to be from within the squad. I’d say Percival is the most likely option.