At Harley's diagnosis of him, the Doctor grinned and winked at her. "Been told a lot of things actually but that's probably one of the most polite variations of me in medical terms."
A little of this, a little of that.. it seemed as though the Doctor was mixing nearly everything at the bar into this drink of his. Even so, he didn't hide his scowl from her as she spoke of the Joker's treatments. "And you never actually questioned his methods?" He wasn't putting the blame on her, but the more he knew the better.
Ivy as in Poison Ivy? Oh, she was from one of those realities. Brilliant. He could absolutely fix her. "Ivy's blood would do it.. She saved your life in more than one way. The alterations it caused has been countering the Joker's chemical ever since you received the transfusion. If you hadn't had it you'd be a vegetable by now.. and that's if you were lucky. How long were you under the influence before Ivy's transfusion?"
"It's possible that the transfusion might have done more for you if it hadn't been forced to fight off the effects of your so called medicine." He stopped his mixing and slid the glass toward her. It was an odd topaz color with smoke bubbling over the edges. "Drink that."
Before she could drink it he started mixing another one. "Dr. Harleen Quinzel. I like that. I'm going to call you Harleen. Don't mind that do you? Good. And no, you aren't going to kill the Joker. Not killing him is what separates you from him. The moment you kill him you're no better than he is. Whatever you've done the past few years were under a malicious chemical influence and you had no true free will to fight back. If you choose to go down that path now and you might never come out."
He slid another drink toward her, this one a dark blue with an umbrella. "Drink that too."