Here Mikaela Shiffrin is counter acted just before the release of her edges. Her next movement is to bend or flex the out side leg and tip the skis to the new angles or new edges.
If you look further down this page you will see the comparison to her GS skiing. In GS she has not yet developed this same ability. In the PMTS system, we teach Counter Acting, it's one of the Essentials. In "PMTS Racer Development", we coach counteracting to eight and nine year olds, so they have it down by the time they are 12.