Fair no try. It was a technical double movement, it doesn't matter whether it's one motion or two.
The ONLY thing that matters, is if the arm was promoted after the point of the ball touching the grass, which it was, you can see from his shoulder that he moved his arm after the point of the ball touching the grass. There is no requirement for "momentum" to stop, then move after that, the only time momentum matters is if they hit the ground and momentum bounces them over without them moving their arm forward.
But as far as the try goes, ball hits the grass, after that point, he moves his arm forward which is a promotion of the ball without momentum, so it's a no try. It's a technicality but it's absolutely the right call.
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