I’ve seen/been involved in at least a couple hundred plus takedowns, and there’s really no way to kill someone doing that without it being really obvious (like bashing the guy’s head against the wall or putting the restraint around his neck).

I would guess that if someone became suddenly unresponsive in the process of being kooky, that the “hallucinations” were from the opiate/drug cocktail that he took prior to arrival or whatever that ended up killing him.