[BerntR]

It does look to me like the arms pull away from the shoulders with a corresponding straightening in the right arm (active or passive) ......can it be any other way?

No I don't think it can be any other way.

G@###it, I failed to ask the right question!

What about right wrist bend. That's what I was looking for: Does it increase when the elbow is straightened (for snap release)?

Bad mistake on my behalf. I'll edit my first post if I can.