Many people would agree that short radius turns and properly timed absorption-extension are needed to ski bumps well. The item that some skiers have been asking about is the pivot seen at the beginning of the turns shown in the QCT videos. What role does the pivot play and what does the skier do to pivot the skis? How is the pivot taught during SVMM clinics?
I'll take a first stab at it. I've tried to explain some of the mechanics/movements in the Fore/Aft thread that's been developing.
Some see this as pivot, I think CVJ describes it as a "feather" into the high "C".
A key thing to remember is that the rotary movements of the femurs/ankles/ankle inversion-eversion are not intended to twist or pivot the ski shovels back across the fall line, the goal or purpose is to develop early high edge angles and shovel edge engagement/pressure starting immediately during transition and continuing into the high "C". When the skis edges are engaged and pressured into the snow, I consider this "carving",even if only the shovel edges, the skis will hook up and naturally turn in an arc and continue down and back across the fall line, they don't need to be "pulled". When making QCT's, we are developing angulation and edge pressure, there is no feeling or intention of "pulling" the skis down and across the fall line or pivoting relatively flat, unwieghted skis back through the fall line, we ride the ski edges through the arc/turn.
The feather at the top of the turn happens naturally as a result of the previous explosive turn finish as the skier utilizes the built up and now released rebound energy as they float through transition weightlessly and move focused edge pressure from aft back to fore or from the tails back to the shovel edges.
Entering into the turn finish where edge pressure has been progressively building as my body/weight finally fully comes back down and I'm progressively extending both knees, Ill usually generate an explosive extra burst of energy by quickly closing or flexing my inside ankle and driving or snapping my inside heel down and forward while simultaneously striking or flicking my pole plant. This shifts edge pressure from fore/mid to aft and marks the turn finish and the start of transition into the next turn.
I'll release the built up edge pressure by immediately retracting both feet by flexing my knees, I'm now instantly floating through transition, my feet/skis are traveling across the fall line and my body basically traveling straight down the fall line, I'll simultaneously open my hips, open my ankles, rotate my femurs (much more so with my new downhill leg), evert my new downhill ankle, invert my new uphill ankle and rotate both ankles downhill. I'm trying to get my shovel edges engaged as early as possible by getting the shovels back on the snow as soon as possible and engaging my shovel edges as early as possible with rotary leverage as I am weightless and it's very likely that my torso is still traveling, not "up" but free falling out away from the steep sloped pitch, I have NO weight on my skis and must develop any edge pressure I can generate with rotary and angulation or movements and technique only.
This is somewhat covered in the thread:
bumps drive hips forward on leg extensions or flick heals back
Where I get into it TPJ and Skidude where they seem to disagree that it is desirable "flick heals back" or retract both feet by flexing the knees to release the edges and simultaneously open the hips and open the ankles to regain ski snow contact when skiing steep natural terrain.
Through transition and into the high "C", there is usually little or no aft pressure on the tails of the skis and they are quite often "in the air" as all or most technically generated pressure is focused on getting the shovel edges pressured and engaged in the new turn. As the un-pressured tails follow the tips, which are now hooked up and engaged through the turn/arc, it creates the brushed feather at the top of the turn or if in the air, appears to be pivoting.
There is a BIG difference between feathering the tails behind engaged shovels through part of the high "C" and pivoting both fully unweighted skis 180° down and back across the fall line. IMO, this is what "pivoting" describes, a pivot turn, the rotary twisting of both skis in a flat plane down through and back across the fall line. Feathering the tails and Pivoting are like comparing apples and oranges as the movements/mechanics and intentions are totally different.