I second that! Totally insane! I don't see this becoming a popular sport. Not sure how the roller blades are even working properly in the grass.
Crazy, but I do have to admit, the horse is quiet and not crazy with that idiot being dragged behind him and over jumps. Now ski-jouring is another thing and a lot safer, been around since the early 1900's! And yes, I skied behind my horse and loved it!