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NFHS: It's OK for the back to move forward before the snap, as long as he's not moving forward at the snap. There's no need for him to pause for one second, because he already established himself as a back by lining up in the backfield. It's not technically a "shift" because he doesn't take a new set position before the snap.
Players in motion who started "from any position not clearly behind the line" must either pause for one second in the backfield or be at least five yards behind the line at the snap.
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