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https://laws.worldrugby.org/?law=18&language=EN 18.2c:
So apparently good call, and good knowledge of the law (as well as skills) from the Welsh player.
Brutal to watch from an Aus POV, though.
At elite level I'm pretty sure but at grassroots it sounds like this law is common.
This thread seems a decent reference, but I haven't seen anything more official.
http://www.rugbyrefs.com/showthread.php?11127-a-second-quick-tap-urban-myth!
Yeah, it was really good to see.
That said, I just watched the game again. When Cruden takes the last conversion, some joker has a green laser pointer aimed at his head.
(Hard to think of any group of 44000 people that wouldn't have a couple of idiots though)