I say the kiter is a tool. He goes and checks out a boat and then crash his kite on flat water... if you don't have control to ride chop without crashing you shouldn't be riding close to boats.
The video title should read idiot kiter crashes kite in front of boat.
I just wrote a lengthy reply amd explanation, but it vanished when I tried to post it, and I hate retyping shit I just wrote, so...
Essentially I agree with plummet. I am not in any way defending the kiter, just looking at how the rules might be interpreted
In a nutshell I think both parties could be considered equally at fault, so if I were to judge I would say - kiter needs to learn from mistake, buy your own lines - power boater clear your own prop, stay clear of kiters in the future, give kiter a ride to the dock - both parties share a beer, shake hands, carry on with your fun.