The reason why I maintain what I said earlier regarding Dave's statement, is purely down to Rugby law 11.2, which states the following.
"It is a knock-on when a player, in tackling or attempting to tackle an opponent, makes contact with the ball an d the ball goes forward"
Essentially, according to this law, the ball went backwards out of Bongi's hands, but forward out of Barrett's hands.... hence the allowed try.
I personally don't even think that Bongi had any control of the ball, but that's another issue entirely, but according to the Rugby law, "The ball can be grounded in in-goal: a: By holding it and touching the ground with it, or b: By pressing down on it with a hand or hands, arm or arms, or the front of the players body from the waist to neck".
So what would happen then if a grubber was put through, and it is going along the side line, heading for the dead ball line, and a player runs over the try line and puts his foot down on the ball before he ends up in touch and before the ball goes over the dead ball line..... is this then not a try....