Pitcher turning the shoulders

[FTVMartin]

This was a first base coach. Fed varsity game. Yelling may be a strong word for it. He was "exclaiming" "that's a balk" each time the pitcher turned to look at his runner.
After the second pitch that he did it, it clicked to me what he was talking about so I took a few steps toward him and said "coach, that's not a rule anymore. it changed about five years ago." HC asked me about it between innings and I gave hime the same explination.

In my mind this was a simple way to control the situation and I didn't hear another word the rest of the game.