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First, I'd like to thank you for your precious work, as I'm doing a research about kitesurfing injuries statistics.
As kitesurfing instructor, I'd like to tell that in picture n°2, I think the guy is intentionally doing a trick. The kite is flying high, pulling him up. As far as the kite pulls the rider above the center of gravity, put the upper body below that point (as in the picture) requires strength, control and intentionality.
In really dangerous situation (those that need the rider to use quick release safety system), you usually can see the kite low in the air in front of the rider (power zone) pulling hard and the rider's legs behind.
I don't want to say that the situation described in the picture couldn't be dangerous at all, but in this case it depends on factors you can't see in the picture (obstacles, beach, other people, maximum height of the jump...).
Again, thanks for your research work and thanks to people working on safety on the beaches and in kitesurfing.