Here's the situation:
Runner starts from second to third on a hit ball. Third base fields it away from bag in baseline and begins running toward third to tag the bag (it's a force) and is ahead of the runner by two and a half steps. Runner excelerates, extends both arms and pushes third in the back so that he is thrown forward, stumbles over bag, falls and loses the ball. Umpire allowed the runner to push the third baseman down in order to get to third. Seems wrong. I can see sliding under him, bashing into him with body, but not pushing him from behind with his hands... Is this ok?
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