The thing is Tamanivalu didn't think he'd scored it either. He didn't celebrate like he thought he'd grounded it properly.
Maybe he doesn't know the Law either, and thought because he didn't have control he hadn't scored it.
Anyway, I had a look this morning on the replay. This what the Law says about grounding the ball
[TEXTAREA]LAW 22.1 GROUNDING THE BALL
There are two ways a player can ground the ball:
(a)
Player touches the ground with the ball. A player grounds the ball by holding the ball and touching the ground with it, in in-goal. 'Holding' means holding in the hand or hands, or in the arm or arms.
No downward pressure is required.
(b)
Player presses down on the ball. A player grounds the ball when it is on the ground in the in-goal and the player presses down on it with a hand or hands, arm or arms, or the front of the player's body from waist to neck inclusive.[/TEXTAREA]
Clause (a) applies when the ball carrier has the ball in his possession, and clause (b) applies to a loose ball in goal.
The important thing is that
"forcing" or
"pressing down" ONLY applies to a loose ball, and the Law does not mention
"control" at all. However, was Tamanivalu holding the ball, did he have possession?
[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 another player before the original player can catch it.[/TEXTAREA]
A player holding the ball is regarded as continuing to hold the ball until he's not holding it any more, until he loses possession of it. In order to determine whether a player has
"lost possession" of the ball, a line has to be drawn somewhere, and that line is
"clear separation"; there must be clear separation between the ball and the hand carrying it. This is why you hear TMO's using the term
"no clear separation"; it means the TMO cannot see if the ball separated from the hand and touched the ground before the player gets a hand back on the ball again. In this regard, think about a basketballer dribbling the ball, and relate that back to rugby. During "upper" part of the dribbling action, the player is pushing the ball down faster than gravity is pulling it - in rugby terms that player is holding the ball even though he may not have a firm grip on it (you often see this when players reach out with one hand over the goal-line). When the ball separates in the "lower" part of the dribbling action, that is separation and in basketball it doesn't matter, but in rugby it does.
In Tamanivalu's first try, there is no apparent separation between ball and hand, and his hand is in contact with the right side of the ball all the way down to when the point of the ball touches the ground, and even if he doesn't have a grip on the ball, he is still considered to "holding" it.
Try awarded and correctly so IMO.