Alain Rolland specifically went around all the teams in this tournament with a slide presentation explaining what was going to be looked at. One of those things was ball carriers leading with the forearm into the throat/head would be tacklers.
Every time the TMO checked in during this match he was absolutely correct on every call. If the right decisions are being made, there is not a lot to complain about. The TMOs are again using "Hawkeye" at RWC.
I am absolutely 100% in support of the idea that TMOs call in foul play when they see it. Simply waiting for the referee to call him in is useless if the referee doesn't see it to call it in.
As for Michael Cheika's remarks earlier in the week (where he said his players didn't need to know the framework for the high tackle sanction) well, I am aghast. What on earth was he thinking? EVERY player should know the possible consequences of what they do and how it is arrived at. One of the ways you learn things is to understand how the end result is achieved.
After Scott Barrett got his RC in the Perth test, Steve Hansen called in a referee coach from NZ Rugby to work with him. As a result of this consultation, Barrett has changed his tacking/clean-out technique - he wants to make sure he doesn't let his team down in the future.
This is an example of the way Hansen thinks. Cheika seems to have adopted a siege mentality.
