DISCLAIMER: I do not own the Avengers or the Justice League.
Black Cat stood at the outside of the warehouse that she knew Flash had run to. She was very good at tracking. She had been asked by Spiderman to find where his beaten enemy had hidden himself. She didn't normally do things like that, but she rationalised it as another favour for Spiderman. Felicity had developed something of a soft spot for the kid.
She turned to face the woman dressed in a suit that resembled a feline who suddenly appeared behind her.
"Guess you think you're real stealthy, huh?"
The woman moved forward, moving with a pure grace that reminded Black Cat of herself. She readied a whip, furling it around in an annoyingly seductive manor.
Felicity rolled her eyes. "Okay. You do realise I'm a girl, right?"
The woman moved right up to Black Cat, moving close enough to kiss her. For a second, Felicity thought she might try. "I know you. You're Black Cat. I'm guessing you're doing the same thing I am."
Black Cat readied her grapple hook. "You were sent to cover Flash's tracks?"
The woman stepped back, looking mockingly surprised. "No. I'm here for a date with Spiderman."
Black Cat attacked with her grapple hook, but the woman struck the grapple with her whip, knocking it aside. Black Cat jumped at the woman, kicking her back a few paces. "And you are?"
"I'm Catwoman. I might just be killing you here in a minute or so."
Black Cat and Catwoman exchanged multiple blows, but Catwoman then lashed Black Cat with her whip, before wrapping her whip around Black Cat's neck and pulling her to her knees. Black Cat fired the grapple hook into Catwoman's face, breaking her mask, ripping it off. Black Cat then used a knife to free herself from the whip.
Catwoman dived at Black Cat, baring metallic claws in preparation to tear at her. Black Cat caught Catwoman by the wrists, throwing her back and following up with a kick to the face. Catwoman then jumped onto a nearby wall, using the claws to climb it. Black Cat fired her grapple into the wall at the top, pulling herself quickly up the wall. She got there only a second before Catwoman did, but it was enough. Black Cat kicked Catwoman in the face just as the other cat burglar reached the roof, dazing her and causing her to let go with one of her hands. Black Cat then latched her grapple onto Catwoman's head, pulling her face-first into the brick wall she still held onto. This stunned Catwoman further, and she lost her grip, falling off the wall and dropping three storeys to the concrete below.
Black Cat climbed down the wall, standing over the badly hurt Catwoman. Catwoman glared, readying her metallic claws to attack if Black Cat came close. Black Cat rolled her eyes, wishing Catwoman would realise that she couldn't even stand and simply give in. Felicity then pulled a loose brick from the wall she had just climbed down, flinging it straight into Catwoman's face, stunning her completely.
"Count yourself lucky I'm here because of the Spider. I might kill you otherwise."
Reasons for this outcome: 1. While Black Cat and Catwoman are very similar, Black Cat contends more often with superhuman enemies, and her equipment is superior, a prime example being her grappling device as opposed to Catwoman's whip. 2. Catwoman is more about stealth, whereas Black Cat, while certainly no Black Widow, has been shown to have rather impressive fighting skills.
