[nickrego]

I am not going to say anything, in the exact situation you stated. Unless, the Defensive coach says something. Then, I would instruct ALL coaches to stay in their respective boxes.

If the runner had run into the coach, I would have called Coaches Interference, and called the runner out. In your scenario, I view the coaches action as a deliberate act to stop the runner, by physical means. That in my book is Assisting the Runner.

And...No where do I remember a rule that states a coach has to be assisting the runner BACK to a base for it to be Interference, as was stated in one of the responses. Coaches can also Assist a runner in making the turn to wards 2nd or Home, or picking them up off the ground to continue running if they fall.