I'm not quoting people here. But this is a general follow-up:
For this particular incident, it is not fair to say that but for the instructor, the diver would not have been in the water and therefore nothing would have happened. We do not know this and since the diver was already certified and was taking an AOW rather than a refresher, we cannot even infer it. As far as the particular depth, we do not know that the incident was triggered by depth and in any event, we do not know if the deceased had dives to that depth. (We all know plenty of OW divers who regularly exceed 60 fsw.)
That's just it, we don't know the answers to these, or many other, questions that would be pertinent to a thorough understanding of the causes of the incident. With the available facts, I can envision scenarios where the instructor's presence would have been responsible for the incident as well as those where it wouldn't have mattered. I would say that, on an AOW certification dive, the instructor's responsibility for any issue that arises increases significantly once the diver crosses below 60' whether they had been there before or not. Above 60', the diver is already certified and expected to be able to take care of herself, but she is only below 60' so that the instructor can teach her how to go there safely.
Remember, though, that we're not looking to place blame here. We're trying to understand what the causes were, and if there are things we could do differently if faced with such a situation for a better outcome. From that perspective, the situation is a diver at 65 fsw with an urgent wish to regain the surface. The first solution would have been to catch something prior to the dive that would have tipped us off and addressed it or called the dive. The second solution would have been to communicate at the start of the incident to understand the reason for the victim's reversal, possibly resulting in a response that could have ended the incident short of death. The third solution would have been to slow/stop the ascent to the best of your limited ability to keep it within safe parameters.
What happened here was something between #2 and #3. The communication and attempt to arrest the ascent both failed and the result was a fatality. If the communication succeeded, the result could still have been a fatality. If the instructor had halted the ascent, the result could still have been a fatality. If you're faced with this scenario in the future, what would you do? Does this discussion make it more likely that we will take the correct action? Will we watch our diving partners more closely prior to entering the water?
I've been around for a while and have some degree of skill and of knowledge. I know and am the first to say that my safety is my responsibility and mine alone. However, when I'm buddied up with an instructor, I still have this little voice saying "Your safer with this buddy than with some yutz."
Reading threads here, one might believe just the opposite. In accident reports, it often seems that dive professionals have other responsibilities beyond being an attentive dive buddy when they are in the water. On occasion, the result is some under-skilled diver who thought they were getting the best buddy available ending up isolated and dead, or saved by another diver who was paying attention.
As far as an instructor being a guarantor, there is a difference between being a guarantor and expecting a significant level of protection. If a diver is killed by a meteorite while diving, it is the guarantor's responsibility. That is what being a guarantor is all about. I've been around for a while and have some degree of skill and of knowledge. I know and am the first to say that my safety is my responsibility and mine alone. However, when I'm buddied up with an instructor, I still have this little voice saying "Your safer with this buddy than with some yutz." And, as far as an instructor being a guarantor, if the instructor was a guarantor, they would not make me sign the waivers and releases of liability.
And, does anyone who is not a plaintiff attorney believe the instructor is a guarantor?
I agree with Thal that you're carrying the application of the term "guarantor" to an absurd extreme. While it might be the correct legal definition, it isn't what anyone has been talking about here. No one EVER said that an instructor should be held responsible to that level. You're making the kind of bogus argument that is the basis of so much lawyer lore. If we had to go issue-by-issue, we'd be here all month, but we could throw out a few examples.
If a diver actually went OOA during a training dive, might the instructor bear some responsibility if the result were injury or death?
If a diver separated from class and ended up too deep during a training dive, might the instructor bear some responsibility if the result were injury or death?
If a diver actually were injured by some sea creature during a training dive, might the instructor bear some responsibility if the result were injury or death?
If a diver had a bad air mix during a training dive, might the instructor bear some responsibility if the result were injury or death?
If a diver became narced and did something stupid during a training dive, might the instructor bear some responsibility if the result were injury or death?
If a diver had a cardiac incident during a training dive, might the instructor bear some responsibility if the result were injury or death?