Stretch to set

[largeone59]

R3. Pitcher is on the rubber taking his signs. He then stands upright and brings both feet close together, but keeps his hands at his sides (then pauses). He then brings both hands together in front of his body (feet completely still) and comes set, then delivers.

Is the move i described a balk?

I know you have to come set in a continuous motion, but when is a pitcher defined as "coming set?" Is it when he starts to bring his hands together, or when he moves his legs in the above stitch?

OBR please.