3 Umpire Mechanics

[SC Ump]

With playoffs occurring, I thought these might be good. I was in a game this evening and there were questions about who does what. I will refer to umpires as PU, U1 and U3.

Sit A: No outs, no one on. Sinking liner to right field. U1 goes out and rules no catch. F9 fires the ball to 1B, who has the call at 1B?

Sit B: R1 on 1B. U3 in B position. Sinking liner to left center field. Is it appropriate for U3 to go out?

Sit C: R1 on 2B. U1 in B position. Sinking liner to left center field. U3 goes out. Ball is not caught. R1 goes to 3B while ball is field and thrown to 3B. Who has responsibility for the call at third?

Sit D: Same as "Sit C", but ball is overthrown at 3B and R1 attempts to score. Who has the call at home plate?

Sit E: R1 on 2B, U1 in B... well actually B+½, instead of positioned on F4's left shoulder, positioned between 2B and F4, on the edge of the grass. This is to better watch R1 leaving early and better position on a throw back. Concerns with this?

Sit F: Same positioning as "Sit E", check swing on a right handed batter. Who should go PU go to? (And don't go back and change your answer for "Sit E". )

Other tricky 3 Umpire situtions that you can think of?