Besides what some have already explained to you, cuffed behind the back, on concrete, knee to head, all of which are cited as a position exacerbating the chance of dying from excited delirium, and the rookie working with Chauvin having been recently trained mentions this twice and asks if they can reposition Floyd.
a few more facts
When describing any medical treatment, it has to be done correctly. Done incorrectly there are countless ways to kill a patient accidentally while performing treatments, whether its administering IV fluids or performing wound care, etc.
You state, I see no mention of arm position, trust me it is important and cuffed behind your back puts full weight on your abdomen and chest into an immovable surface, the street.
Google any article on proning to promote breathing and it is quite specific with pictures, but at a hospital you will be trained on all of it. You are on a soft bed, the head of the bed in inverted so that you are lying slightly upside down, pillows are place under your abdomen and chest to give even more cushion and to promote comfort while asking the patient what feels best, the arms are comfortably at your side.
Your texts here describing the positioning of Floyd by Chauvin as being put in the prone position like youve read they do for Covid patients is unintentionally humorous at first, but now embarrassing as you politely keep defending your position.
Please stop, you appear to be an otherwise intelligent and nice person. I do think Chauvin has some arguments that give him a better chance than most would concede of getting off, but it isnt good odds.
Also, I agree Floyd was in trouble already because of the drugs he took. He did look in medical distress and said I cant breathe before ever resisting arrest as they first tried to put him in the car. I believe thats why an ambulance had been summoned.