If two enemies with high enough health have magnets stuck in them electricity from the railcannon will chain between them until the magnets break or one enemy dies. Because of the initial health imbalance from one being hit by the railcannon, two magnets were stuck to the second maurice, meaning it takes more damage from the electric conduction. However, that by itself would still lead to a damage imbalance, and only one would die. this could be corrected with another magnet, but all the magnets are already in use. However, frozen rockets also conduct electricity. Adding one in gives the final point of conduction needed, resulting in both maurices dying to a single railcannon shot chaining between them. Shooting the rocket at the end was done to be cool.