In the clip of the play it is pretty clear that Demuth's head is turned, looking at the feet for the neighborhood play. The transcript of the post-game conversation seems to confirm this. Demuth had a couple things to watch, and the tip off the glove happened while he was looking elsewhere, at the worst time possible. It was really a perfect storm.

I don't think the signal to offer help is converging on the guy, he probably glanced around and saw every umpire giving him "the look".

Does anyone think that the umpires would have gathered even if Farrell missed the play and did not come out?