HELP ME FIGURE THIS OUT PLEASE.

We use a cadence for shotgun snaps

When you see it being done on a college or pro level......its due to the sound.
Once the qb lifts his leg, the center will snap and the line goes on movement.
Same as a punt or a field goal attempt or extra point.
At the High School level we use a cadence except during special teams then its hand motion (Punt, extra point)
In the semi-pro level we use silent alot....during the time before the snap, the qb is calling out plays. As a quard I can see the ball being snapped but also in shot gun we are in a 2 point so its not hard to see motion from other players.