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Ozone Kites Aus said..
Good visual explanation, except that the range of AOA adjustment is exaggerated, there are no (Kitesurfing) kites I know of that have that range of adjustment.
The airflow looks really slow in the video (~1 knot), possibly just to highlight the transition phases. As the windspeed increases, it takes less angle of attack to start separation and cause a stall (generally ~20deg).
It's also worth noting that because the angle of attack is relative to the apparent wind, and that the kite can only swing around in a hemisphere, there are some extreme AoA angles that can be generated in certain circumstances. Imagine a kite directly downwind, but stationary. The wind would be blowing directly underneath the canopy and your AoA would be close to 90 degrees. Even if you let the bar out all the way, your AoA will still be ~70, far beyond the stall angle. Once backstalling starts on a calm day the kite can easily get deep into the wind window where the problem gets worse and worse. The solution is still the same though, let the bar out to attempt to get the kite flying properly. If the bar throw isn't enough, grab the centre lines and pull them toward you to get a bit more AoA reduction.