I don't know the letter of the law but that was a grub tackle by a young bloke who in my opinion has a history of grubby play. And it cost the game. Needs to room with Barney so he can learnPlay the exact game in a parallel universe. Instead of the hit being on Walsh, the poster boy of the NRL, lets just assume it was on Drinkwater. It wouldnt have been a send off.
Reckless tackles are not sendoffs.