It's the television match official's job to spot these acts of foul play, especially in the build-up to a try. After every try the TMO will tell the referee via his earpiece "the try is good", or otherwise.
The Crusaders could also make a case for asking why Curtis Rona's try was awarded when he appeared to be a metre in front of kicker Beale in the direct lead-up. Then again, they were perhaps lucky to get away with a potential tip-tackle in the final seconds of the match when they were desperately hanging on.
There are several other factors to consider when judging the missing of the Moody act of foul play, for which he has been suspended for two weeks.
The first is, and this is counter-intuitive I know, all the match officials missed it. That wasn't the case when Brumbies wing Chance Peni knocked Israel Dagg into Disneyland a couple of weeks ago during the Crusaders win in Canberra.
Peni's act in smacking Dagg across the face with a forearm as the Crusaders wing leaped for a high ball happened directly in front of an assistant referee. Referee Jaco Peyper then viewed it several times on the big screen and agreed with the TMO that there was "no excessive force" used. Dagg went off for a concussion test and re-injured his troublesome right knee.
Peni was banned for five weeks and I would argue that the officials' misjudgment of this one was an act of incompetence far worse than the Moody miss.
The other factor to think about is how lucky the Crusaders were to be playing at home. If they were anywhere else – and particularly in Australia or South Africa – an eagle-eyed television producer is likely to have spotted it and the replay would have been shown ad nauseum on the big screen, attracting the attention of first the home crowd and then the officials.
The try would then have been ruled out and the Crusaders placed in serious trouble.
The Crusaders were extremely lucky and they will know it. So are the All Blacks - the two-week ban will still allow Moody to play against France next month.