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If you watch the video carefully, you'll notice that both knees stay bent the entire time.
When I explain this to my students, I describe it as "both knees are pointed" or "both knees are pointed forward."
The equipment used here is NNNBC. The boots are low-cut leather boots, so the ankles can move very freely. That means it's possible to move the knees forward without lifting the heels.
(By comparison, with plastic boots or high-cut boots, ankle movement is restricted, so the heels have to lift in order for the knees to move forward.)
When both knees stay forward, the hips don't have to move back. In other words, both feet can remain directly beneath the upper body, including the hips. This creates a straight axis of rotation. That's why spinning is possible.
If you can spin, then a tight mogul pitch isn't a problem. In fact, a tighter pitch is actually easier because it provides automatic braking.
I think this is one of the clear differences between alpine skiing, where the heels are fixed and the boots are high-cut, and NNNBC.
And, provided the snow isn't too hard, I don't think NNNBC is necessarily more difficult than T4 boots.
In the end, it all comes down to where you see the advantages of a free heel.
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