Illegal Snap, Motion?

[ajmc]

NF: 7.3.6 & 7 covers this. "Only one player may be in motion at the snap and then only if such motion is not towards the opponent's goal line. Except for the player"under the snapper",....the player in motion shall be at least 5 yards behind the LOS at the snap if he started from any position not clearly behind the line and did not establish himself as a back by stopping for at least one full second....."

So, if a player on the line simply takes a step backwards, so he's clearly off the line, pauses at that position for a full second, (a separate shift by which he establishes himself as a back) he can then go in motion without being restricted to the 5 yards behind the LOS requirement.