If a BP were around your neck, you'd also have both hands to get at it. I find it hard to believe someone who believe there was a serious threat to their life wouldn't be able to pull a BP off their neck should the circumstance arise. I would remit that they have the capability to do it, but I wouldn't hesitate to allow one around my neck, should I be fully cognizant. I can see a drunk person passing out and being finished off by a BP, but that's one of the very few scenarios I see in which the BP wins.