3 man rotation question

[AtlUmpSteve]

Originally Posted by CecilOne

Let's say the OP runner gets to 3rd but the throw goes over and R1 tries for home, creating a rundown. If the PU had come into fair to make the call, does the PU stay in fair and the U1 takes the foul side of the rundown?

It seems obvious, but I seem to have heard the PU always takes the foul side of a rundown. Is that only in 2 ump?

Look at it this way; once the PU goes to 3rd, and U1 covers home on the rotation, which one is functionally the PU?

For all and any reasons you heard explaining why the PU needs to be on the foul side, those same principles apply to U1 covering home in the rotation.