wait... I'm messing thigs up in my mind
what matters here is if the foul happened before the pass is touched, either behind or beyond the NZ, right?
A foul for Defensive Holding will occur BEFORE the ball is in the air, after the ball is released, that same action is now DPI.
The penalty for Defensive Holding will include an automatic first down if 3 things happen: 1. The foul occurs beyond the NZ, 2. The fouls occurs against an eligible receiver and 3. The legal forward pass crosses the NZ
The last one is where a lot of officials get messed up because they see the pass physically travel beyond the NZ, but to know if the pass "crossed the NZ" by rule, we need to consult rule 2-19-3. For the purpose of penalty enforcement (and other stuff), the pass is not deemed to have crossed the NZ if it is first touched behind the NZ even though the ball may physically travel beyond the NZ.