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If there is a question of rule interpretation I believe you should provide the coach an avenue of appeal. Since the PU will be the one who’s interpretation is being questioned the appeal should be to the TD or UIC. The tournament game should be delayed until a final ruling by one of those two is made, (they should be in attendance or immediately available), then continued from that point.
Last year, during a PONY tournament, I (PU) had an Infield Fly with bases loaded dropped. The winning run scored. The other coach insisted that the runners had to tag. We stopped the game and got the TD to confirm that we made the correct ruling. Very easy and resolved quickly. After the game this coach and his assistant insisted that they had the same situation the week before and called National. They claimed National told them the runners had to tag on a dropped IFF. If the PU had to make the final ruling it would have ended in a forfeit with a lot of grumbling parents and coaches.