I'm not going to attest to the veracity of this video, but cutting off the supply of blood to the brain rather than restricting the flow of air to the lungs makes most people pass out in under five seconds. It's often as little as a second. Rewatched, gonna call fake. her ankle isn't tight enough in the front to restrict the throat. Also you'd want to use the bulge of the calf rather than a bony ankle for that. The meaty parts of her thighs are too far back to cut blood flow.They'd need to be where her knees are.