That’s one that I think you have to let go. Even if there is minor contact.
At the end of games, (especially a tie where a foul would basically give the game to one team), here are what I consider okay to call.
Egregious contact on a shot - An example would be if that Gillis guy hacked the hell out of Plummer to try and stop the layup at the end of OT1 against Purdue. REGARDLESS of if the ball goes in or not, if it’s a hard “trying to stop the shot from going up at all” you call it.
Unfair defensive advantage on a shot - If the D bodies up/jumps/swipes and contact is minimal…but the defensive play is construed as unfair because it kept the offensive player from being able to perform a shot unobstructed by an illegal defensive move, call a foul. This one is the most tricky and subjective but you know it when you see it. (It’s also the closest to a standard foul)
No shot attempt 30 feet from the basket? - The ONLY time I call that foul is of it gives the D an advantage. For instance, Murray definitely did the arm bar thing…and definitely pulled back trying to show innocence. But there was no shot going up and the Rutgers player was barely affected. I would only call that foul if, because of the contact Rutgers lost the ball and Iowa gained possession. Minor contact that far from the basket by itself may not change the outcome of a game, but minor contact that causes a change in possession could.
Just some thoughts from a not former ref.