Pretty ridiculous decision if ou ask me. Sure it's dangerous technique but it's so, so soft. There was no intent to harm him there, the ref should have had a word and played on. No way can they ban him for that after already sin binning him during the game.
There was an absolutely identical incident on Travis Burns in the second half that was absolutely ignored by the ref.
Talking of refereeing decisions, I'd like to see a replay of the Carney try from the kick. He's so fat and slow that there's no way he would have had time to move forwards 10m, plant his feet and wait for the ball to arrive if he was where he should have been when the kick went up.