Batman swung down on Joker and the impostor Batman. He took down Joker, told Black to get lost, then went after the impostor. He finally caught up with his impostor, Black Mask. He escaped after gassing Batman. Back in the cave, Bruce found some problems with the medication inventory at Dr. Thompkins' clinic and what was (or wasn't) given to Stephanie. It appeared that she'd been neglected of her needed meds.