Tbf, I wasn’t aware that the refs could go to TMO for that kind of thing. Ref’s decision alone would probably have been a yellow but with the TMO reviewing it…well, we’ll never know. O’Mahony possibly deserved a yellow for the sweary over-reaction and I think it was his reaction which made the ref go to TMO. Like I said, it tarnished the game for me. No problem with the result – well beaten on the day and there really was no need.
Having said the above about O’Mahony, I have no idea how it feels to be upside down and wondering if my career is about to be finished so I assume that’s why the ref let the afters and the sweariness go.