Feeling his father is too self-righteous and stubborn, he sides with Superman's more forceful way of obtaining world peace and warns him of Batman wanting to stop Superman's plans of imprisoning the inmates of Arkham Asylum. After Harley Quinn starts a riot within the Asylum, Robin is attacked by Solomon Grundy, but saved by Nightwing and Superman. As the riot continues, Robin inadvertently kills Dick Grayson when he throws one of his kali sticks into his head, causing Nightwing to fall and break his neck on a piece of rubble.