The Killerball is the name of Planet Mort’s official sport. The Killerball professional teams played its deadly matches using high-powered spheres that could harm, or even kill a careless player.
Not being quite an athlete himself, Schneider didn’t understand the rules very well, but he was fascinated about such a bloody sport where death was a common occurrence. Thus, he decided to create a drone able to shoot bouncing energy spheres as a homage to the one and only sport ever to interest him.
https://www.youtube.com/watch?v=OHeih-Uxfos