Then that contact had no impact on the play. If the pass is gong to a different receiver, unless it's a personal foul it's nothing.
Most fouls fall into one of three categories:
Procedural (offsides, illegal formation, delay of game)
Advantage/disadvantage (holding, pass interference, block in the back)
Safety (clipping, block below the waste, chop block)
Safety fouls should be called any time they happen. Procedural fouls should have a higher threshold to be called late in blowout games (don't get too technical). Advantage/disadvantage fouls generally have the most judgment involved and most have additional philosophies/tools that help to reduce the gray area and provide consistency.
The ultimate goal of an official is no flags on a game. I've never had a game as a crew with no flags, but I've had done with none. I'm an umpire so there's usually something procedural at least I have to flag. I only average 4-5 holding fouls in the course of the season (9-12 games) and I had 1 season with only 2 (and one I didn't like on video).
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