Amelia grunts as the bat connects with her shoulders, but manages to catch her breath enough to swing around Harley's body by using the woman herself as a balance and pulling with the arm around her waist. Once she's behind Harley, she hops into the air and attempts to wrap her legs around her friend's waist to get a height advantage. If she can manage it, she can bring her dagger hilt down on the top of Harley's shoulder and force her to drop the bat. If not? She'll figure something out on the fly.