Harley having that age-old conversation with Batman about killing The Joker because of how it does more harm than good.
"And whatever stopped YOU from killing him Quinn?"
"He always overpowered me, always, he always *something* up his sleeve, even if it was those cute puppy dog eyes of his.. -_-
not that I wouldn't do it now, given the chance.."
"oh darling, I didn't know you cared..", you know who says as he enters the now three-way exchange.
"heh.. and you just had to come, knowing I'm without my gun, didn't you?", she continues half that thought turning to Batman.
"I guess we'll just have to settle this mano y mano, *puddin*", the Joker then says with a smile as always.
"..just know that the old 'kiss me first and then attack me' thing won't work on me, besides that is SO Poison Ivy.. or is it more Catwoman", he then adds.
"well this cat right here has some claws herself!", Harley not wasting any time to do a 'claw swipe' on the side of the face and knowing his every attack pattern (if ever had any), knowing his tricks, then hitting him square in the face and aiming to rip off his joy buzzer right off his hand but in all the excitement, she ended up ripping off his whole hand.
"Oh! ..exercise lately, Harls?"
"some god gave me super strength, not important, I just remembered but not important :)"
She throws the severed hand right in his face then proceeds to apply the joy buzzer within the same moment using the hand and everything as misdirection, right to the clown prince of crime's crotch!
"AHHHHHH. AHAAAHAHAHAHAHAHAHAAAAAA! THAT BURNS AND TICKLES SO WELL AHAHAHAHA! REMINDS ME OF WHEN *YOU* WOULD BE DOWN THERE!"
Batman is just watching really seeing what Harley will do next seeing as how it's more their fight than it is his.
"OH YEAH!? OH YEAH!? WELL *BECAUSE* YOU REMINDED ME.."
Harley then took a moment to jump on both of her ex's feet at the same time possibly cracking them, maybe even breaking them and then bent down to tear off his pants, put his dick in her both then with all her strength tearing it right off with her mouth, chewing it up a bit then spitting it right out in his face, blood and everything. then in the adrenaline, she rips off both his arms and wastes no time to end it with a bit.
"My Mr. J, lend me your ears!" yes she rips them right off, as well and bites off his nose and spits it out.
"in fact, lend me your whole head!" then kicks it as it breaks/shatters and splatters on impact on the brick wall of the Arkham Asylum basement they were in.
"GOAL! HAHAHAHAHAHAHAHAHAHAHAHA!…"
Batman feels so many things as he watches this while keeping his usual composure.
"WHO'S LAUGHING NOW! WHO'S LAUGHING NOW! HAHAHAHA.. WHAT'S WRONG BATS? DID I JUST BLOW YOUR MIND AS WELL?
… because look, you may walk around looking all scary and like you're all that but here's the difference between you me: you can look scary but *I* can actually BE scary!"
"The scariest night I ever had to endure was the night when-"
"you were a kid, it wasn't your fault, it never was and it never will be, but maybe stop acting like one!"