balk question

[SanDiegoSteve]

I don't know.....I was always taught that a jerky shoulder turn/head snap kind of move should be balked. How is that any different from a feint from on the rubber? It is not the speed of the turn that is in question, it is the intent of the pitcher, which is fairly easily ascertained with judgment. If by his jerking the shoulder, he causes the runner to dive back into the base, I would say that is the same as faking a throw to 1st from the rubber.

I does not need to be slow and deliberate. It just can't be deceptive, as this is what the balk rule is intended to stop.