ubiq,
“I dont really understand your question.
The entire neck is compressible, Chauvin had Floyd’s neck pressed against the soldi ground
This would absolutely be expected to constrict the airway whether constricted anterior or posteriorly if it is held against a fixed surface (the ground)”
True, if there is hard surface at both sides, such as the knee and something else, that would compress the trachea which would occlude the airway and asphyxiate the victim. However, just holding one’s knee to the posterior of the head does not necessarily asphyxiate, I am trying to picture this and it seems that the head which is a large bony structure would actually prevent the ground which is flat and large to compress the neck.
Unless there was a smaller hard object that compressed the neck anteriorly.
Which is why they are naming it positional asphyxia. Positional asphyxia also is used to explain why despite being able to talk, which requires inhalation and exhalation the victim still asphyxiated.
As I noted, I might very likely be completely wrong with all of this, but if we focus on the dry facts, the facts are not so clean. (I have still not watched the video, and have no intentions on doing so at the moment).