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Gentle suggestion:
If you do have an on-track situation that you would like to clean up with the other driver, discuss it with the event Chief Driving Instructor or Safety Marshall first and trust their judgement regarding how to proceed. The best approach is to discuss the specifics calmly in a neutral environment with an event official present. Approaching a driver in his pit area who was aggressive on the track often leads to breaker bars raised in anger. A near miss on track is bad. A broken face from an adrenaline charged rogue driver is worse. Choose wisely.