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I think there are two reasons...first being to help with the Referee if their is a bad snap, but the most important one is to make sure that the scrimmage kick passes the line. If the kick passes the LOS it can only be advanced by R, but if the kick does not pass the line of scrimmage, aka blocked kick, etc., the ball can be advanced by either K or R. So the HL needs to know if it passed the line.
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