I think we're debating semantics. Perhaps my understanding of "positional asphyxia" is incorrect. I'm thinking of it as synonymous to positional suffocation. That could be incorrect. Consequentially, (by my definition) a collapsed trachea or otherwise occluded airway is a red hearing. If the suspect died of positional asphyxia associated with excited dysphoria, it was still the officer's knee that kept that the suspect in the position where he struggled to breathe. Perhaps the suspect would still have succumbed to the excited dysphoria even if the officers had sat the suspect up. Who knows? But based off of what the Author wrote in the rest of the article, it seems like keeping the subject in the prone was the wrong course of action. I'm not judging the officers. I am not in law enforcement; was not there in the moment, and have not seen the missing segments of video. I'm just trying to understand the point the author is making.