During the chaos of the riot at Arkham, Harley is confronted by Poison Ivy, who, while having The Joker anchored to a wall, demands that Harley choose between her and him. Harley keeps Ivy talking long enough so that the Joker can free himself and together, they attack Ivy. With little effort, Ivy contains the Joker and she and Harley continue their dialogue. After Ivy appeals to their friendship in a sustained attempt to sway her, Harley uses this opening to move in close to Ivy and take her out.