After taking Oracle on a wild ride through his mind, while Batgirl and Wendy try and stop him from the outside, Calculator and Oracle find their way out of his mind….
….just long enough that Wendy can dump him back in, alone, and leave him trapped as a prisoner in his own head. As punishment for everything he’s done to her and her brother, including the fact that her brothers nasty looking corpse was in the room with them.