In all three books (NFL, NCAA, FED) if the offense commits an NZ violation, it's a dead ball foul, no play. In NFL and NCAA, if the defense jumps offside, it's a live ball foul. If a defensive player touches an offensive player, or causes the "O" lineman to move, then it's a dead ball foul for encroachment. In FED, there is no offside foul, all NZ violations are dead ball fouls (encroachment).
Bob
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