We had this situation in a game last week, and I believe the umpires made the correct call, but I'm not sure.
Nobody out, no runners on, routine grounder to SS. Throw is high and up the line....1B makes a good play, catches the ball and tags runner as he goes by. The base ump remained basically on the foul line or just a step inside, so the baserunner blocked him from seeing the tag, and he ruled the runner safe. I went out and asked the base ump if he could check with the plate ump to see if he saw the tag, which he did and runner was called out.
The other team was upset saying that it wasn't the plate umps call, but in my opinion this is how a two man crew has to work....the base ump couldn't see the tag, so he got help and got the call right. (Granted, my "opinion" might would change if I was in the other dugout).
Did the umps do the right thing? My only problem would be that possibly the base ump didn't get far enough around the play to one side or the other to see the tag, but I'll also admit that I don't know what the proper mechanics are for the base ump on that play. Maybe he always stays roughly on the line and I've just never noticed.
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