I'm not sure what the fuss is - locking onto the ball and holding the player up has been a tactic for years. It is a great way to turnover ball and it forces the attacking player to be conscious of their body position in the tackle. »
I think that's pretty good and could of even been longer - the action falls into the category of undue care for a player in a prone position ala Frans Steyn's tip tackle on Cruden that earned him 5 weeks. One difference I see here that may have called for a longer ban is that in Steyn's case, it was in the heat of the moment with milliseconds to react. This action was post-tackle and not even play-related.
It's totally a sending off offence - the tackle wasn't too bad, some might argue no arms but I think he attempted a wrap. The problem is - it was a big tackle which clearly rocked the player, at that stage he could have concussion, he could have a neck injury - there could be any number of problems which could have been exacerbated by Halaufia bouncing his head on the turf. And it clearly wasnt just a case of rubbing his head in the dirt, Pierce's head was a ways off the ground and he bounced it into the turf, that action in itself is enough to give someone a concussion. Clear intentional dangerous play = red card.
Fekitoa's was amazing but he did run through a tiring (mainly forward) defense that were only really seeing him on the super stage for the first time. Barret's was good in that they almost blew it twice and still managed to score, but the best try is Leiua's. He had multiple players on him all the way from the half to the try line and beat them all with a variety of different skills...