I've watched this video maybe six times since I first saw it, and I still have no idea how he makes the ball bounce to himself. The only rational explanation for this is he is a wizard and a potential danger to society.
Actually, it'd be kind of funny if wizards were given magical powers, and instead of fighting regular humans directly, they just did weird optical illusion stuff to screw with our brains.
Like, instead of the Death Eaters Avada Kedavra-ing Muggles, they would just go to our largest cities and do really mindbogglingly confusing magic.
Is that more or less screwed up than all that stuff Voldemort did?