On the matter of the penalty kick at the Cake Tin (Boks v. Wales) and referee Barnes:
Whether Barnes shoulda, coulda, was going to but didn't, ask the TMO about the kick going over, it would have been an interesting process.
Had I been the TMO and been asked about the kick I would have looked first at the side view to judge at what point of the curve of the kick the ball passed the plane of the posts (Point P). Then I would have compared that with the highest part of the kick (Point H). I then would have judged whether Point H was before or after Point P, and by how much.
Then, looking at the head on view I could work out Point H again, roughly, then, by reference to my earlier comparison, I could work out where Point P was head on, and compare that to the position of the upright.
If I could not work out where Point P was on the head on shot with any clarity, or if I thought that any part of the ball could have touched the upright if it were higher, I would have to report that I could not overrule the ARs.
The thing is that there is no protocol for adjudicating on kicks - as far as I know. The question should be: "The Assistant Referees have ruled an unsuccessful kick - can you see any reason why the ruling should be changed?" - or, vice versa. The underlying assumption would be that certainty would be needed to overrule.
The disappointing thing is that it was known that the goal posts at the Cake Tin were relatively short and, IIRR, that the success of kicks has been queried in the past. There should have been an expectation that there was a 1% chance of the need for intervention, and this should have been part of the officials' preparation for the game.
Not good enough for a RWC guys. Not good enough.
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