No need to turn arms or turn th skis with your body. Counter productive and leads to rotation. This is nothing like that.
You are confusing the two motions. Its simply a groomed turn performed at a different angle. Its a vertical turn and not a horizontal turn. The stand up portion is the float through the turn just like on a groomed run where the transition takes place with the plant. You still extend and retract your legs on a groomed run turn don't you? Don't you staighten your legs across the fall line and push out during in the beginning of the the turn as you increase your edges? And as the turn deepens retract the inside leg to make room for the angle and turn? Then you finish by floating flat across the fall line while countering your body towards the next turn when you "touch" the next pole plant. This is what I am talking about with a 3 dimensional turn. It is identicle to a groomed run turn, just turned on its side. Just think about it. It is identical. try it first.....Yes, you extend to turn and retract to come up out of it. As you push down and edge, you turn, as you finish and transition, you retract. Yup, we agree. It may sound off but its identical once you think it through. no different. Think about a short swing turn, you extend and retract there as well. Your body is upright and straight heading in the direction of the next turn. No different.