This is a good video. There certainly are multiple methods of inducing unconsciousness relat8ng to choking. Not limited to:
1. Primary airways obstruction by pressure on the trachea. This is slow and painful
2. Occlusion of internal carotids (vertebral arteries not withstanding), if you compress these, you go to sleep quickly. In actuality, if you are squeezing in the right place, you will also have some jugular constriction. Most chokes in martial arts utilize this (and perhaps some of 3). I can say, there is a definite difference in feeling between 2 and 3, namely, you don't turn purple, and you don't feel the same "pressure" or swelling , as the carotids are occluded, so there is no excess blood trying to refurn from the head. One other note, is those choked unconscious by this usually don't twitch (certainly not to the degree in the video.). Slightly faster than 3. I believe I've seen this mentioned as the ratchet method or night night
3. Primary jugular obstruction - this is interesting, as what is depicted in the video is almost like a mini tamponade. The pressure in the venous system increases so that it is close to arterial pressure. What is depicted in the video is the sudden release of pressure results in a rapid outflow of blood, dropping bp and causing syncope. I think the release Of pressure as seen in the video is essential for the rapid unconsciousness. Definite feeling of pressure or swelling in the face (similar to if you hung upside down for a few seconds until your BP started to regulate.