Well, the Crime Syndicate (Ultraman, Owlman, Super Woman, Johnny Quick, Power Ring, The Grid, and Deathstorm) have appeared on Earth and dispatched all 3 Justice League groups with only Batman, Catwoman, Cyborg (what's left of him), Steve Trevor, and Constantine escaping to different locations. They announce that the Justice League is dead and turn the world over to the villains. To show what they're capable of, they beat Nightwing and reveal his identity to the world. They plan to kill him, but Owlman's keeping him alive because he reminds him of his universe's version of Dick Grayson, Talon. At the moment, he's tied up in their HQ.