I think Plato said "A fool can ask more questions in a minute than a wise man can answer in his life."
I'm proving that with this thread.
Some great discussion here.
I sure don't know the physics or technique that has changed to produce the butterfly arm movement that has evolved over the last few years,
But you sure can see the best flapping their way down a course in what looks like linked recoveries.
I do believe it is linked to the pole plant or phantom pole plant move used to get you out of the back seat at the end of a turn.
I see it more in the more difficult sections of the course.
It is easier to see from behind when I see the arm drop back just as the turn is finished and before reaching forward to re-center and plant again.
It is a little like a classic XC skier doing a double pole plant and skate step in maximum acdeleration mode.
The best GS racers have to make a huge recenter move; some of them are damn near sitting on the tails at the end of a hi G turn with their hand behind their COM.
Unless you can squat about three times your body weight this wouldn't work.
One more reminder that professional athletes are not like ordinary humans.
Ligety flapping furiously as he stivots..
Maybe the flap and the stivot are linked????