Right, seen it now; borderline between red and yellow under the current interpretations (due to the ball carrier's dip) - wouldn't complain about either colour.
It's also a great example of why I like the orange card option - 20 minutes without a player, and then a replacement allowed on.
Not a fan of the Aussie punditry team (in this care SBW, so not an Aussie) argument of "I don't like that a ref's decision changes the game this much - we all know the guy is going to get up and play the rest of the game". A] It wasn't the ref who decided to tackle like that. B] Whether a serious injury actually occurs or not isn't the point - the point is that is was a dangerous action, specifically dangerous in a way that everyone knows rugby is trying to stamp out of the game.