This escape is based largely on timing, but because of your position and connectedness, you should be able to rely on tactile feedback to make your move at the right time. Start by wedging your inside arm between you and your partner, just like you want to do for nearly every side control escape. As your partner switches their hips to scrape your arm free, use their weight shift to sit up during that moment. To augment their reaction, grab the back of your legs, creating fantastic momentum as you sit up.