MikeFerrara:...this blowing bubbles while searching nonsense...first get something to breath and then sort out your other equipment issues. If I lose a reg it'll be hanging off my right shoulder since it's on a wrapped 7 ft hose but if not my backup is right under my chin where I can even get it in my mouth with no hands if I need to. If my buddy drops a reg and doesn't have the common sense to switch to a backup my primary will be presented for their breathing convenience. Again, if every one is breathing we have plenty of time to see to whatever else might be going on and troubles rarely come one at a time.
I'll second that. There have been several times that for whatever reason I've switched to a bungied backup sans hands.