Balk prior to Set position

[joemoore]

OBR

There are 2 legal pitching positions: windup and Set. You are not in the Set position until you bring your hands together and stop.

From the set position, you can pitch, step and throw to a base or disengage by stepping back off the plate with the pivot foot.

Why is it a balk if you disengage the rubber by stepping forward prior to coming Set? Prior to coming set, you are not in a legal pitching position and there can be no deception. A runner will not break for second before the pitcher comes to a Set Position.

It happened today with the bases loaded, the pitcher and catcher were unclear on signs and so the pitcher stepped forward to meet the catcher. Balked in the tying run (for our team).