Give Me a Ruling?

[Justme]

Umpire judgement call -

The umpire must have felt that when the 2nd baseman whacked his fist into his glove it deceived the baserunner into believing that he had caught the ball. The umpire must have felt that this prevented the baserunner from advancing to 3rd base.

If the umpire judges that the baserunner would have advanced to 3rd (or tried to advance)without the deception then yes, he should have given him 3rd.