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The NZ is very much a rule up north. Nobody may encroach within the yard before the ball is snapped.
Beyond that, I think scrimmage rules (with regard to the NZ) are pretty much the same on both sides of the 49th. If Oline moves before snap its a whistle and Procedure call, if the Dline jumps but gets back before snap without breaking the Oline plane, no whistle.
It does get a bit juicy when the Dline comes before the snap and the Olineman pulls up in response. We usually tag the Oline with procedure if they're across from each other, but some in our association disagree and its usually worth a couple of hours of drunken back and forth at pay night....beats talking about the upcoming election I guess...
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