I know someone who got really hurt by an errant kite way up from the beach while they were rigging their own kite, the leading edge bonked them and in trying to make it better the other surfer almost took their ear off with the lines.
Yep, kites are definitely dangerous in the hands of the inexperienced. And even the experienced: A local kiter got a piece of one of his fingers cut off instantly as he had a line inadvertently wrapped around it and suddenly coming under tension. The piece was never found. He is now proudly exhibiting his "war" injury!