[mbyron]

I have a couple questions for the OP?

1. Why are you flagging a BIB 40 yards away from the play?
2. Why are you calling a BIB a PF?
3. If the foul occurred during the play (before the TD), why are you worried about canceling the score?

From what you've said, I'm guessing that the foul isn't really a BIB, but rather a cheap shot on an unsuspecting lineman who was watching the play. That's a PF all right, but not for BIB (even if that's what he did to earn the flag).

The cheap shot or unnecessary roughness might have occurred before or after the TD. You have to make that call and enforce it accordingly. If you have to bring it back, so be it: YOU didn't cheap shot anyone. How's a kid going to learn not to do that without consequences?