Okay, then somebody please explain how a RHP executes a "jump turn". I always believed both feet had to come up simultaneously--in other words, the pitcher "jumps", which is why the move has that word in it.
Heck, to me, this looks more like a jab-step, but he "jabs" his foot behind the rubber instead of in front of it. And since the jab is behind the rubber, it constitutes a disengagement.
And, No, I don't have Jim Evans's balk video.