Try to bargain...

What have you gotten yourself into now? Had you known that you would have faced off against such a bruiser when you were apprehended by the officers, you would not have hesitated to take your punishment like a man.
But now it is too late for that. You have heard about violators before. You have heard how they stay in the station, how their papers are passed from agency to agency, some getting lost on their way, and how they stay there for months, even years just waiting to be processed. During that time they are alone, restrained, surrounded by sex-crazed policewomen who gets off on bossing men around like dogs. And that is before they are even sentenced...

Just thinking about what awaits the next 15 to 20 years of your life makes you gulp, unless you can make it to your apartment before you are caught; and having the police sicked here certainly won't help.
You watch the young athlete, the nylon fabric of her shorts sticking firmly to her thighs, outlining her groin. She seem like the sincere type, the type of scholarly woman who believes saying one thing and doing something else is an irrational contradiction, but you still get a bad feeling about her, as if she is hiding something...
Before you agree to her you decide to discuss some unclear matter.
"Uh, listen, uh... miss..." "Just call me Cherry" she laughs rubbing your hair "Yes, miss Cherry. Listen, as much as I appreciate the fact alone that you gave me a choice and, uh... I certainly don't expect to get out of this situation without a sacrifice. But while I, uh... certainly don't mean to question your generosity, there are some flaws in your proposal that makes it, uh... perhaps not as tempting as you might think. Of course, I don't- Ow! Ow! Ow!" she started pulling your hair. You can actually feel your feet leaving the ground and, of course, a deep pain in your scalp. "Get to the point, shorty" she says, her grin not hiding the amusement she feels from you squirming.

"It- it's just that..." you start off in a panicky way "I am fine with taking a little punishment to get out of this, but if I end up hemoraging, broken bones or anything that requires medical attention, then I will end up in police custody anyway, and the whole point will be moot. Plus, I will have attacking an unarmed woman on my case. Provoked, of course, but we both know it matters- ooof!" Cherry dropped you down on your butt with a loud thud. "Obviously that won't happen" she walks briskly towards you with her hands folded, her legs hovering now above you like two tall towers. "if it comes out I assisted a curfew violator, then I too will be in trouble with the fuzz."

You are really intimidated by her composure, but you continue to argue.
"W-w-well... I... you would obviously say I attacked you... and... and your words would w-weight more than... and that you did it in self-defense... you know... you know what I mean, right?" You can hear your heart beating, cold sweat is running down your forehead. You have never been so nervous, so scared in your life, so it is no wonder that you are barely coherent. Looks like she understood you though.

"Good point" she says between her giggling "But what do you want me to do about it, boy? Obviously we will be wearing protective gear, and no dangerous moves allowed. Do you want me to fight you with one hand behind my back?"
"Well.. I didn't... that is to say... you don't have to- wait, are you serious?" you stammer, realizing that what would only be spoken about in the most ironic manner was in fact a genuine suggestion "Sure" she says capriciously "I need a challenge, and it looks like you need a chance to get **** for the way women everywhere have been treating you for so long. And afterwards I will help you escape"

You still have a lingering feeling of suspicion, but this opportunity simply is too good to pass up. Once you have gone outside kicking range, she would be unable to defend against half the attacks, even far less, and her own attacks, only being able to come from half the direction, would be fairly predictable and easy to block. It would also mean that her stance would be severly compromised, meaning her attacks would be weaker and toppling her a triviality.
In exchange for giving her a good beating, she agrees to help you escape.

"Sounds peachy" you say trying to hide your grin.
"Great" she says reaching her hand out to you. "Alright, let's gear up!" You grab her arms and let her help you up on your feet...