That looks like bow steer. If you watch the video you see that sharp front entry "grab" the water in the turn, basically stopping the front of the boat and the back end slides around. I have a carolina skiff, it likes to slide or "chine walk" in a curve, but thats generally a smooth lateral motion, it's never wanted to swap ends.
I've also seen bow steer happen to flats boats with sharp entry drivng in a straight line into a quartering chop, the sharp entry would grab the wave coming in and spin the boat. Scary stuff to experience.
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