Get to the goal line ASAP after the snap. This may include 'reverse goal line' if A is going out so you can rule on a safety.
If you have him down before the ball crosses the GL, then hit the whistle and run in pointing to the ground, selling your call, "NO NO he's down here!!"
If you loose sight of the ball, then you need to go in to the pile and search. Don't rush your signal or whistle.
Watch the ball and the knee at the same time. This is why we get paid the big bucks.
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