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WR
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*************************LOS
The original post did not indicate he paused and set after moving forward. If he had, this would clearly be illegal motion as he would then be an established lineman and would not be the required 5 yards behind the LOS at the snap. However, here how I am reading the original post. The WR, who has established himself in the backfield, steps forward (so as not to draw any kind of false start flag) and goes in motion on his side of the NZ towards the TE. This should not be terribly unusual as full backs do this frequently where they may take 2 or 3 steps forwards before they go in motion laterally.
Yes a motion can be stopped at any time and the player can re-set - Legal Shift.
Yes the motion can continue through the snap and, as long as he is not moving upfield - Legal Motion
The question in my mind is whether it is legal to be in motion on the line of scrimmage if you are established in the backfield. I can't find any rule prohibiting it or indicating a specified setback (say 1 yard off type of thing) and thus am inclined to rule it legal.
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