A few comment on "tankdive's" comments. I agree with all of your points. However, I have never thought, nor do I teach my students, that a guide is trained and able to respond to your underwater issues. I have been in places where the guides are not DM's nor even trained as rescue divers. They are guides who find critters for you and show you the site. The worst scenario is someone who is only able to buddy with the guide because that's like having no buddy. They have other things to do. In many places showing critters is the most important responsibility and all others on the dive want it that way.
We make it a point on all boats we're on to offer a single diver to buddy with us. I'd like to think I treat my newfound buddy like my other buddy, usually my wife. No, not the beginning of a joke. Anyway, I believe this has much more to do with how we as an industry now allow folks to be certified. It has less to do with money grubbing operators. As a fill-in instructor for two local shops in the Chicago area, we only teach confined water over either a five or seven session experience. Knowledge review classes are the same timeframe unless the student did E-learning. Open water is the same everywhere....I hope. I have seen the alarming rise of, "I'll certify you in a weekend for cheap" operations. When I see these outfits at the quarry for OW, it is scary what goes on. Yet, their students end the 4 dives with a c-card. Taking longer to work with students allows you to discuss what really happens on trips. I expressly tell my students that the professionals and guides staffing the boat are not their safety line. I tell them that they and their buddy are responsible for their lives, their safety and their experience. I really believe that the overzealous march to certify the world has led to an environment of assembly line certifications which allows for folks to end up having to rely on a DM who may not even be a DM. I am not saying that happened here, just in general. I know that this board has many very excellent shops and instructors logging in on many subjects to add their expertise. However, if we're honest, we see things that make us pause as the industry seems to be rocketing to certify in lightening speed and competing with cost cutting measures that makes things less safe than we should expect. Standards are one thing, explaining the way things really work takes more time.
Sorry for the long rant, but in this case, I can't lay the blame on "money grubbing" operators if there even is blame. Sometimes bad things happen. If anything, maybe we learned, if you are leading a dive, call it, signal abort the dive to the group and get your distressed diver ON THE BOAT at all costs. We've all been on dives that have been aborted for one reason or another and never been upset if someone was sick or needed help.
Rob