In defense of coach's physical assistance on a HTBT play... obviously, a precarios position

Quote:
The BR starts walking toward her dugout where she is met by the 1st base coach who taps her lightly on the shoulder just outside the dugout.
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I read that to say BR is just a step or so from entering DBT. Without action by the coach, she
will enter DBT and be declared OUT. Obviously, the coach was trying to get the player's attention without tipping off the defense.
Coach says, "Sally, stop." legal.
Coach taps her on the shoulder. physical, right? Assisting her, right? (got her to stop). Why isn't that BR- OUT? Does the "lightly" part mean it was not illegal? My read of the sitch was the tap on the shoulder caused the player to stop walking. Can't do that, coach.
Anyhow, that is the reasoning behind my answer, above.