Ben,
Send me a video from the side.
Look up ulnar deviation on google. Think of how she can apply this articulation violently... to work the index finger down the ball... resulting in the appearance of a snap up after release.
Perform that movement with the hand inside the ball, with a widened 2-seam grip (see pauly pics).
Mike
Thanks Java. I sent a vid from the side. Ulnar deviation makes sense and will try to explain it to DD. I tried to find the "Pauly pics" but didnt have any luck. Perhaps someone could direct me to them. Thanks again and look forward to hearing from you.