The dog barks.

[Adam]

Originally Posted by LDUB

It is the exact same rule. For 6 players the foul occurs when it is discovered an official; the ball becomes dead at that point (there are exceptions regarding tries and tries in flight). On the barking dog play the ball becomes dead when the player starts acting like a dog. When the case play says that the official must wave off the basket that means he must give the no score signal as he may be sounding the whistle very near to the time that the try is starting or while the try is in flight. The no score signal makes it clear that the goal didn't count.

In both situations the ball becomes dead when the foul occurs.

I can go with this, it makes sense. The case play says the player scored; to me this is clear that the official's whistle came after the score. That said, it still makes sense, because if the officials catch the 6th player before the ball is in the air for a shot, the foul has occurred.