Maybe not in your book but certainly in the rule book which is the thing we all go by.

Yea, if it hits the floor before he catches It again.

Well, yes, if this is the correct definition of a knock-on:



So if whilst juggling the ball the player has knocked the ball towards his opponents' dead ball line he has knocked on.
According to the copy of the laws I have play should continue [iafter[/i a knock-on in certain circumstances (the player regaining/kicking the ball). None of which are relevant to the Watts try. Although I do appreciate that the laws of the game as practised by the officials are different to those we mere fans are allowed to know of.

In my view it's the laws on tries that need to be changed. I agree with LadyRef, that these tries are mostly being given correctly in line with the current laws, but I also agree with the view that the law needs to be changed to having full control of the ball (ie, having hold of the thing) or 'downward pressure with the palm of the hand' if the ball is loose. Let's get rid of tries that are given if someone brushes the ball with a fingertip or rolls their forearm over a loose ball. They might be in the laws of the game, but I don't think that enough skill is involved for them to be in the spirit of the game.

That should also make it easier for refs who don't have access to a VR.