Catcher swamped - right at last.

Paul Williams of the Blues kicks a high ball downfield. Will Genia of the Reds, under pressure, catches the ball. Three Blues players grab him and several Reds players join in.

All the players are initially on their feet. It is a maul.

The maul collapses, the referee decides the ball is unplayable and awards the scrum to the Reds, making a catching gesture.

When the ball becomes unplayable at a tackle the scrum is awarded to the team going forward.

This time the Reds were going forward but that is not the reason why they got the put-in at the scrum. The tackle law could not apply as there was no tackle. There was a maul.

Law 17.6 UNSUCCESSFUL END TO A MAUL
(a) A maul ends unsuccessfully if it remains stationary or has stopped moving forward for longer than 5 seconds and a scrum is ordered.
(b) A maul ends unsuccessfully if the ball becomes unplayable or collapses (not as a result of foul play) and a scrum is ordered.
(c) Scrum following maul. The ball is thrown in by the team not in possession when the maul began. If the referee cannot decide which team had possession, the team moving forward before the maul stopped throws in the ball. If neither team was moving forward, the attacking team throws in the ball.
(h) Scrum after a maul when catcher is held. If a player catches the ball direct from an opponent’s kick, except from a kick-off or a drop-out, and the player is immediately held by an opponent, a maul may form. Then if the maul remains stationary, stops moving forward for longer than 5 seconds, or if the ball becomes unplayable, and a scrum is ordered, the
team of the ball catcher throws in the ball.
‘Direct from an opponent’s kick’ means the ball did not touch another player or the ground
before the player caught it.

The only time this applies is when there is a maul from a catch - not a ruck from a catch and not a tackle from a catch. Only a maul.