My issue with it, is, should competing for the ball be a determining factor.I thought it was a YC when I saw it, obviously the refs saw it as both contesting the ball, and on that basis their decision was correct. I think its fair to say that about 8 times out of 10 that sort of collison and timing would result in a YC, but there will always be times where some observers of the game disagree with the perception held by the referees.
Mitigating in the correct circumstances but what I saw was Brown basically win uncontested and Tuculet made a half arsed attempt at the end, scragged him down and he landed on his head. Subsequently, he didn't play again and may not play against Australia.
Red Card.