[johnnyg08]

JEA:

Professional Interpretation: “Physically assisting” implies that the coach did something by touching the runner which improved that runner's chance of accomplishing his goal as a runner. In other words, touching alone does not constitute physically assisting. The umpire must be convinced that the runner is trying to get back to a base or is trying to advance with a sense of urgency.
When a play is being made on the assisted runner, the umpire should call "Time" and enforce the penalty. The runner is out and all runners return to the bases occupied at the time of the interference (assistance).
If no play is being made on the assisted runner, the umpire shall signal that the runner is out and allow the ball to remain alive. This enforcement principle permits the defensive team to make plays on other runners if possible.

Case play from JEA:

Runner on 1st. The batter smacks a line drive base hit into the gap in left center. The runner flies around 2nd and is determined to score on the play. The 3rd base coach is pointing for the runner to stop at 3rd. Seeing the runner is not going to stop, the coach gets in the runner's path home and is run over by his charging player. Both fall to the
ground. The runner gets up and barely gets back to the base ahead of a tag. What's the call?

RULING: The coach's action should be considered physically assisting. He probably prevented his player from being thrown out at home. However, the runner is called out for his coach's actions. The B-R returns to the base last touched at the time of the collision.