Funny this should come up now, considering I did my first (scheduled) solo umpire game in... in... Uh... 9 years?
Senior men's SP game (so even the prescribed mechanics are mostly out the window). Bases loaded. Batter hits a decent shot, and all other runners score. Bang-bang play on BR (now R4) at 2B, and I made the best call I could from near the pitcher's plate, a few steps towards 3B. Runner looked like he got his foot in there before the tag, so I call safe. The defense (in particular, the pitcher) squawks.
But hey... They only wanted one umpire, so what can I do? If it had been a 2-umpire crew, the call *might* have gone differently, but no sense in second-guessing what I felt was my best call possible, given all the circumstances.
That's just how it goes, man.