What should happen?

[NCASAUmp]

Originally Posted by Dakota

The request for the BU to go to his partner for help on a pulled foot had no effect on R1 or the play at home. Run scores id BR ruled safe. If the result of the umpire conference is BR is safe, then you call the defense back out onto the field and resume play with a runner on 1B and 2 outs.

If, OTOH, it was ruled the call of OUT on the BR caused the defense to not make the play at home, then R1 would be returned to 3rd.

Well, the OP says that F3 immediately turned and made a play for R1 heading home. Doesn't sound like F3 was hindered, so the likelihood of INT is pretty low. And call me crazy, but if that were actually the case, wouldn't R1 also be out? Defense has to be able to make the play, and BR is already out...