"Gemini"
*At Dickerson's place, Nightwing mixes it up with the fake Changeling, while the real Changeling and his cousin are imprisoned (in power inhibiting collars). Flamebird tries to bail him out with a personal check, but that isn't allowed, but she does head off to the rescue when the police hear of what's happening at Dickerson's. By this time, Nightwing has deduced that the Changeling he is fighting is indeed a fake, but is unable to bring him down due to Flamebird's interference. He is however able to post Gar's bail and give him what clues he has, then taking a bit of time to suggest to Flamebird that she hang up her costume.
Changeling follows the clues to Chinatown where he discovers someone who looks suspiciously like Madame Rouge, his mother's killer, who really ought to be dead. *Source: DCUGuide.com