[LAWS]Knock-on: 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 another player before the original player can catch it
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1. The red player knocks the ball forward
2. The red player never catches the ball
3. The ball does go backwards off the Red player's leg, but then first touches the ground clearly in front of where the red player first knocked the ball with his hand.
There is nothing in the law that states the ball going backwards off a player negates the fact that it was previously knocked forward.... "...a player hits the ball forward with the hand or arm........ and the ball touches the ground"
For mine, the key issue is, was the place it first touched the ground "forward" of the place where it was first knocked by his hand....
It very clearly was, so IMO, this is a clear knock-on.
As for the first try, I am 50/50 as to whether or not it should have been allowed.
I guess its a lesson that professional rugby players need to have learned by this stage of their careers - the game is 80 minutes long, and you can't afford to snooze for any of it, not even a second.
Be alert! Your team needs more lerts!