... I was told by my trainer that if a driver passed another under a local yellow flag before clearing the incident he was guilty of PUY. If the car he had passed passes him back before clearing the incident then he too was guilty of PUY, and we were to report both. ...
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As a corner worker, I'll say "report everything from the corners". The Stewards are the judges, not us out on the corners. Now, I certainly "annotate" my reports with things like "seemed unavoidable ... appeared to be a racing incident", or "appeared intentional, seemed ill-advised" if Race Control asks, or there's a written report, but in the final analysis, it's up to the Stewards, not the corners.