What is the law preventing, and when is the spirit breached. No, but an ounce of prevention . . Using preventative management helps reduce the requirement to have to deal with it. Second, be consistent, at least within that game, should another PK be awarded. If you're going to call it an infringment and order a retake, do it immediately.
Hesitation creates doubt.
And finally have the courage to make the call. It's like that first caution for encroachment . . Real intense game. I was watching the game with a USSF grade 4 and a USSF 7. Don't ever call it.