BECAUSE ULTRA MAN IS GOING TO KILL YOU DEAD!
This would be November's cover to Justice League #25, the solicit text is as followed:
FOREVER EVIL continues as the Crime Syndicate hunts down the few heroes left foolish enough to challenge them—including Batman’s protege, Dick Grayson. But Owlman has other plans for Nightwing...and Owlman’s teammate: the most deadly being on the planet: Ultraman!Dead! DEAD! DEEEEEEAD! Damn you Didio!