Oooh, not sure about that Stu.
Maybe not the most certain call of the game, but he has played and refereed it that way the whole game. McCaw pushes the limits and must surely know that he will get penalised for some 50/50 calls (especially when he gets away with it 90% of the time). He really is the master of pushing the limits of the laws of getting away with it (to his credit).