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Right. The back goes in motion then the QB steps under center and starts his cadence. This is an illegal shift since you had two in motion at the same time but the QB shifted (stopped moving) when he placed his hands under the center. Had the ball been snapped before the QB had been set for one second you would have had an IM. Since the ball was snapped after the QB was set for a second and the back didn't stop moving, you have and IS.
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