I doubt there was anyone else there... "breath control" as a fetish is something people practice in either a kneeling position, or while lying in bed. (Less chance of injury should you pass out and fall.) No, the hanging in a closet routine is almost always a sign of the solitary practishioner... I think poor David was going for an "untimate orgasm" and accidentally choked himself.
Number Two: Conform, Number Six! Conform!
Number Six: I will not be stamped, filed, indexed, briefed, debriefed, or numbered! I am a person.