[Manny A]

The MLBUM has a section on Getting the Call Right. If memory serves (since I don't have a copy available right now), the recommended "signal" that Joe Torre alluded to would come when another umpire(s) has additional information that the calling umpire may have missed. An example given in the MLBUM is when a calling umpire may be blocked from seeing that the catcher dropped the ball on a tag play at home.

I have no problem accepting that. But in this situation, DeMuth had the whole play in front of him. He was just victimized by shitty judgment. And shitty judgment, IMHO, is not the time when other umpires come to the rescue of their partner.

That's exactly why Jim Joyce's call stood against Armando Galarraga. And Tim Welke's call stood against Jerry Hairston. Those were egregious misses that all three other umpires likely saw, but they didn't "seek to reverse" the call by walking toward them or giving them some other signal. Joyce and Welke knew better, and I'm surprised Demuth didn't stay his ground as well here.

{Edited to add} This will undoubtedly have repercussions down the ranks to us amateur umpires. Now when we have a clear miss on a play that's right in front of us (and we all have them on occasion), coaches will point to this play to argue their cases that we must go for help. An unfortunate precedent has been set, IMO.