Writer: Grant Morrison
Talia has Batman trapped in Wayne Tower.
Robin leaves the Batcave and heads there to help. He thinks he can talk his mother into stopping the Leviathan attack.
Nightwing sees Robin heading that way and they go in together. Damian's full-grown twin knocks Nightwing out and, after a brief battle, stabs Damian through the torso with a sword.
Batman escapes, but is too late to do anything but cradle the lifeless body of his son.