She managed to get her arms wrapped around his leg before he could interlock his feet behind her back to complete his guard and cut off her attempt at an ankle lock, which meant that he could do little from his current position to prevent her from leaning back to trap his leg. She was faster than he'd given her credit for, and in another circumstance that might have cost him. In this particular circumstance, however, with both her legs outside his own, she had no way to keep his back on the ground as she began to pressure the ankle, so all he had to do was sit up and follow her back until he was sitting on top of her stomach and the arms that held his lower leg. From this position, she would have no means of using the lock to her advantage, and both hands would be trapped beneath him as he began to rain heavy blows down on her face. With his right knee spread out to her left and his left foot planted just below her right armpit, he had a good base to give his punches power, and each one would be driven down with unrelenting force. He was careful though to avoid overextending in the case that he miss, as it wouldn't do any good to put holes in the brick of the alley floor and very likely damage his hands in the process.