Quote:
Originally Posted by BktBallRef
We do it as a courtesy to the coaches and players, so that there will be no question as to whether the player is on the LOS, off the LOS, or in "no man's land."
As for the other questions, the LJ and BJ should be counting the defense. The umpire should be moving to the line incase of a close passing sitch, as well as officiating the blocking and pass rush.
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I'm from NC, and our association's mechanics are exactly as BktBallRef stated.
I've also been told that, in addition to being a courtesy to coaches and players, we signal both on & off the LOS to confirm to the opposite wing (and possibly to observers) that we haven't overlooked this part of our pre-snap routine.