2-umpire system, and your BU is still sitting his happy butt over in B. Trailing runner is heading for 3B, and you see there's gonna be a tight tag play. I see this a lot with rec-league umpires.
Let him fry? Or you make the call?
And yes, for the record, I have been BU and brain farted on this very play. Fortunately, I had a good PU with me, and the calls were made without anyone noticing I'd screwed up (except my PU, of course).
Hey, I'll admit it.