Full video and multiple camera angles at:
Here Yael demonstrates how to make sure an attacker stays down once sent to the floor. After a knee the groin and tripping the inner leg, she applies a full force stomp into the testicles with high heels. You can tell she doesn’t hold back as you see her leg muscle tense up as she hits the target. To maximize the pain and damage she explains how she sharply twists her heel while its buried deep into the target.