Jump-Step to 2nd Base

[whitecane12]

When the pitcher has his pivot foot in contact with the rubber (usually in the set position with a runner on second), he must maintain contact with the rubber unless he disengages the rubber. Raising the pivot foot off the ground requires that he disengage to the rear of the rubber.

Any time I've seen a pitcher do the jump, spin and throw move to second the pivot foot remains on the home plate side of the rubber and therefore has not properly disengaged the rubber. In order to be a legal move to second the pitcher must either disengage to the rear of the rubber first, then complete his turn and throw or he must turn toward second while maintaining contact with the rubber, step toward second and throw.

In my viewpoint, the jump and turn throw to second is a balk because of breaking contact with the rubber with the pivot foot without disengaging it immediately.

Any thoughts on that?