One explanation for what might have happened is:
"If you click on Youtube in the bottom right corner of the video, you can see in the high quality version at Youtube, that Karolina was leashed suicide style to her chickenloop with a clip which could catch a steering line if she pulled one end of the bar near it. Then she seemed to have no way of releasing her handlepass leash if being pulled backwards. She has probably corrected those two mistakes now."
and
"I believe it's small kite 5-7m. Leash caught one of the steering lines. Wind speed? Doesn't look too windy, maybe 25knts..."
http://www.kiteforum.com/viewtopic.php?f=1&t=2357124
This is an example of a smaller, faster kite in stronger winds. Some of the more severe looping accidents have happened in high wind, approaching 40 mph +. In those cases the rider is yanked violently across the water in sudden power jerks as the kite cycles through loops. I once saw someone do this at Hobie probably eight years ago with a traditional C kite in around 20 to 24 mph. Despite the lower wind speed, he was still yarded about 10 to 15 ft. horizontally at high speed out of the water with each loop. In that case his wrist leash wrapped around the line winder on the far side of the bar. Good thing wrist leashes are out.