Say that the girl, by her violent and repelent nature, threaten to kick or knee you in the balls while you are escalating (and not harassing her). She has friends with her and may be testing your guts, so she can make fun of you, when you choke.

How to respond to threats in a funny and confident way way?

I think I read this as a response to an "I'm old enough to be your mother" shit test.
Just tell her that you've only just met and it's far too early for her to be telling you about all of her fetishes.

Of course, assess the situation though. If she's in a group with some very big very unhappy looking guys who are walking toward you while brandishing knuckle dusters then maybe a different tactic is required. Like saying "I'm sorry, I'm just not into that kinky stuff" and using the body language that Melodical describes in this post then leaving.

Do you really want to be with a girl with a "violent and repelent nature" anyway?

Of course not, but shit happens...

Thanks for the tips.

How to deal with violent women? You don't.

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If she wants to knee you in the balls you are obviously not escalating but fucking harassing her dude.

Not entirely true. She could be a classic crazy girl with her shit tester in overdrive due to arousal. Crazy girls drive good things away... that's why they are crazy and don't have what they want in their lives.

Of course, one needs the calibration to tell this from some girl getting pissed because she is being pawed at! Seriously. Takes some understanding to pick that out.