Bases loaded, 2 outs.
Ground ball to 3B. Rather than step on base...as he moves to his left to field the ball he is face-to-face with the runner trying to get to 3rd.
A runback/down ensues eventually tagging the runner out, but the umpire declares that the runner on 3rd scored before the out was recorded and thus the run counts.
I believe the umpire blew it as there was a force out at every base and even though there was a tag for the out, the force was still in effect and thus the run shouldn't count. The umpire countered that once the rundown/back began, the force was negated.
I think the umpire was wrong.
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