BR passes R1 after HR

[voiceoflg]

Actually happened last weekend. NFHS scrimmage. R1, no out. Batter hits the ball over the wall in left center field. CF jumps up to catch ball over the wall but comes up empty. R1 rounds second but thinks CF catches it, rounds second back and heads toward first. BR rounds first and passes R1. R1 then realizes his mistake and heads back to second passing BR. Both cross the plate.

Umps confer behind HP. I heard the conversation as I was right behind the backstop. 1BU said both are out for passing each other. 3BU said neither are out because the passing happened after the ball went over the fence, that when the ball went over, it was a dead ball and both runs score. PU said BR only is out for passing R1, and once BR was out R1 passing him back did not matter. PU was nice enough to offer me the full explanation and his ruling stood, one run scored, one out.

Based on my knowledge of the rules (not enough, but gaining more) I believe the PU was correct. Was he? Is it different for NCAA and OBR?

Thanks.