And exactly how would you do that PF with adults capable of making up their own minds and having free will? What in your training says how to do this. Get off it already! If you want the DM/DG to keep you safe and control the dive and everyone on it, pay him to do that and be sure before you leave the dock that's what he/she will do. It cannot be done the way you'd like it. Oh we could tie everyone together and put remotes on their bcs and regs but even then stuff will still happen. The fact is the divers were free, over 21, and not morons. The instructor who did not effectively let them know what they were capable of and what their limits were is where this all started. If they had been compentently trained, if everyone were competently trained we would not be having this discussion and THEN YES, HE WOULD BE ALIVE!