Yep - from your link
(1) Blood Choke. A blood choke is performed on the carotid artery, which carries oxygen-enriched blood from the heart to the brain. The carotid artery is located on both sides of the neck.
(a) When executed properly, a blood choke takes
between eight to thirteen seconds for the opponent to lose consciousness.
(b) The blood choke is the preferred choke because its intended effect (i.e., the opponent losing consciousness) can be executed quickly, ending the fight.
(2) Air Choke. An air choke is performed on the windpipe or trachea, cutting off the air to the lungs and heart.
(a) When executed properly, an air choke takes between two and three minutes for the opponent to lose consciousness.
(b) Due to the length of time it takes to stop the fight with an air choke, air chokes are not recommended and will not be taught in this course.
(c) As an instructor, you need to know the difference between a blood and air choke because, when a blood choke is incorrectly performed, most likely the student is applying pressure to the windpipe and executing an air choke.
I've read it, link was provided because it is the manual and the training that the former marine had access
In the video and the imagery we have seen and the anecdotal stories of what happened we know that Jordan was approached from behind and the position the former marine type person probably engaged in a REAR chokehold.
However the photographs and videos appear to show us the
ENHANCED real chokehold described here.
Recall Jordan was quite small in stature.
(b) Technique. (1) Apply a rear choke. Your body should be against the opponent's body. (2) Bring your left arm over your opponents left shoulder and grasp your left biceps with your right hand and place your left hand against the back of the opponent's head. (3) With your left hand on the back of your opponents head, and your elbows in, push the opponent's head forward and down. (4) Draw your right arm in, maintaining pressure with your biceps and forearm on both sides of the opponent's neck.
Figure-Four Variation. (a) Purpose. The figure-four is a variation of the rear choke and it allows you to gain more leverage on the rear choke. If you cannot secure the rear choke, you may apply the figure-four variation to increase the pressure of the choke on the opponent.
This is why it is so alarming.
Recall chokehold lasted up to 15 minutes according to all vague reports because they are all quite vague..
There's only a few minutes of video..
I don't see this as a black/ white problem at the moment.
I do see it as a dehumanisation of a sick person and I do see it as a vigilante attack that was unnecessary.
Some passengers moved.. everybody was free to move..
The language used in the media about his demeanor and actions, throwing rubbish around is clearly hearsay and varies wildly. There was no rubbish to be seen.
The train was his home in his mind, I think.