Try wrestling.

You spent a lot of time grappling with your big sister, so you feel more comfortable trying to wrestle. Helene locks up with you, but before you can try to grapple with her, she kicks you hard between your legs. You feel like you're going to throw up and she easily pushes you down to the mat. She ends up sitting behind you, her legs wrapping around your stomach in a scissors hold. She starts pouring on the pressure. You're in trouble already - do you try to power out, maybe get to your feet, or try to pry her legs apart, maybe see if you can wriggle out of her grasp?