Snap/Dead ball fouls

[Forksref]

Originally Posted by Ref inSoCA

You answered your own question.

Wrong.

2-16-2a Types of fouls are: Dead ball-a foul which occurs in the time interval after a down has ended and before the ball has is next snapped or free kicked. (example: false start)

2-16-2i Simultaneous with the snap-an act which becomes a foul when the ball is snapped or free kicked. (example: illegal motion)

The motion is not a foul until the snap (simultaneous). A player could go in motion toward the line and then change his direction away from the line before the snap and it would be ok. It is the snap that makes the motion toward the line a foul. This has nothing to do with a dead ball foul.