You were a hero/heroine, who had caught Harley stealing, after everything that happened with the Joker and her. She thought she was going to be a heroine, but it wasn't something that was very hers.

"Hey bombom, are you going to let me go or not? Although if you don't want to I won't complain"

Harley said funny, you had strangled her with your arm to make her stay still but apparently not even that worked to make her stay quiet for a while.