I have to agree, Piutau hit the ball, but it still left the hands of the ball carrier. Its a murky one, certainly the commentators were not convinced at all.
Its not even murky
[TEXTAREA]LAW 12 DEFINITION: KNOCK-ON
A knock-on occurs when a player loses possession of the ball and it goes
forward, or when a player hits the ball forward with the hand or arm, or when the
ball hits the hand or arm and goes forward, and the ball touches the ground or[/TEXTAREA]
The Law does not say anything about HOW the player loses possession, only that he has lost possession. The Red player lost possession, so its a knock-on, and there is nothing else to consider. The fact that the white player knocked it back is irrelevant because it didn't go forward from him, therefore Law 12 does not apply to him.
The situation where one player has possession of the ball and it is dislodged in a tackle should be judged as follows;
In all cases, the
Gold player is carrying the ball and is tackled by a
Blue player....
1.
Blue player strikes the ball, knocking it out of the
Gold player's grasp and it goes forward towards
Blue player's dead-ball line = knock on
Gold
2.
Blue player strikes the ball, knocking it out of the
Gold player's grasp and it goes forward towards
Gold player's dead-ball line = knock on
Blue
3. The ball is dislodged without
Blue player touching it and it goes towards
Blue player's dead-ball line = knock on
Gold
4. The ball is dislodged without
Blue player touching it and it goes towards
Gold player's dead-ball line = play on
While the new TMO protocols have helped immensely in the getting of correct decisions, no amount protocol can make up for referees that don't know the Law. In this case the referee and TMO made complete arses of themselves, and basically talked themselves into making a decision that was not only wrong in Law, but which was critical as it led directly to the scoring of a try that should not have been awarded, and even worse, it ended up being the difference between the two teams.