I may have been interpreting this incorrectly for a long time. I know there are instructors who for certain teach it incorrectly. From the stretch position as I start my launch, if I take the flat underside portion of the knob towards the ball, the barrel will arc backwards(depending on pitch location there will be more or less arc), there will be a tight pivot around my back shoulder. But again all of this depends on proper body mechanics. If I am simply instructing what my hands are doing without proper sequence or involvement of other muscles, tension, stretch etc, then the demo will look strange and awkward