2 umpire mechanics

[CecilOne]

Ignoring the possibility that R1 was >3' off base line avoiding tag.
1) PU needs caffeine.
2) One specific missing - was F6 inside or outside the base line when fielding/throwing.
3) Looks like the BU was outside the base line if blocked by R1 who was outfield side of F5 - ok if F6 was inside, or if too quick to be elsewhere.

Obviously, BU would be better off closer to 3rd to get a better angle, might have been too deep if swipe tag was inside R1 and outside base line.

4) BU would have been inside if moving past F6 to see play at 1st; then turning to follow the ball. Like to think I would be and certainly would have preferred, but w/o knowing more about F6 depth, number of outs, hard to say.

Is that a start?