Accepted practice says that the PU should take the call at third for a number of reasons:
- the BU is heading toward 1st to watch for a potential pulled foot which is common on this play,
- the PU has the perfect 90 degree angle on the play whereas the BU will be looking through the runner's back,
- the PU really has nothing else to do other than be a spectator.
The critical thing to remember here is that after making the call at 1st, the BU has to head for home for a potential play there on an overthrow of 3rd; all the while avoiding F3's throwing lane (and causing the overthrow of third).
Yet another complication to this play can happen if the BR is safe at 1st and that's a throw back from 3rd to 2nd to attempt to retire the greedy BR. The best thing for the BU to do if the runner is safe at first is to move to a position between the pitcher's plate and 2nd out of F3's throwing lane and watch the play at 3rd. If the ball is not caught, then move closer to home while watching the runner on 3rd. If she goes then move toward the plate and yell to your partner (the PU), "I've got the plate". The PU should then move into a position to take a potential call at 2nd. If the runner on 3rd does not try for home on the over throw, move back toward 2nd for a potential play there and let your partner know, "I've got 2nd". The PU should then head back toward home for a potential follow-up play there, lingering a bit to make sure that there isn't going to be a late play at 3rd on a sleeping runner there.
Done properly the dance can be a thing of beauty.