Kate's rolled up by Johanna's shift upwards, on her back and legs trapped. She releases Johanna's leg, left with no other decent options to salvage the hold and no leverage to put more than token pressure on the joint. She probably ought to scramble away, here. Instead she kicks out in the opposite direction, a little roll gaining her some brief momentum, enough (along with gravity) to let her pop her hips up and try to catch her knees around Johanna's neck. She's sort of upside-down and pale enough - naturally and especially of late - that even a brief moment of it has her going red, the flush across her cheeks from exertion suffusing face and ears and down her chest.

It's not exactly a high-percentage maneuver, but what the hell. If it works at all she can tug the other girl's head down to her torso and either try to cut off air by smothering her against sweaty skin or maybe rearrange her nose all over again. That it's pulling Johanna on top of herself is maybe not the best idea, but she's hoping a tight enough grip around the other girl's throat will make up for the disadvantages of her position.