I'll use the definition given to be at the clinics I have gone to. The Foot Must Gain Ground!
Having said this, if he raises his NPT in a step toward 1st base, then he is going. If he does anything else it is a balk.
He can raise his leg and have the knee pointing toward 2nd and he can pitch or go to 2nd.
If after he has raised his knee, he goes to 3rd, it is a balk.
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