I think we're talking about two different things here. The A lineman can block as long as they make immediate contact and do not go beyond the expanded neutral zone.
If a back or end blocks on a pass play (a pass that crosses the NZ) downfield before the ball is caught, its PI. If a lineman is going out to block for a screen and blocks his man downfield and the back catches the ball beyond the line, what do we got? OPI, that's what.
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