Mechanics Question

[CecilOne]

In spite of feeling a bit like Tom, and thinking I've seen that scheme before, some comments:
- D or C3 is a bad position with 2 umps (the real ones, also the pseudo "D" above)

- with two outs, I definitely think C1 is better, head to PP-2nd halfway point for plays at 1st. This is almost the same angle as when we come in from A to call a play at 1st
- with a runner on 3rd, also C1 because an ump can get to a perpendicular of the runner's path quicker and the SS and ump do not get in each others way, even if the SS is throwing to 1st

- the PU has to be aware of where the BU is and the importance of the play at 1st, even before the throw goes there
- a runner from 2nd gets past sooner at C1 than C2

All of this obviously depends on umpire quickness, fielder positions, etc. but it causes no problem I see. Also, it's partly setting up to see runner(s), pitcher and plate from the same spot; often an adjustment to SS position.