That's kind of how I looked at it when I registered us for the rescue diving course. I don't expect to be able to rescue anyone on my own but I would like to at least be able to recognize when someone might be having issues before they get to that point. Correct me if I'm wrong but it sounds like you think that it's still a good idea to proceed even at our novice level?
I do. For all three of you. Especially if you all dive together most of the time. When I taught I emphasized that any in water responses should be done as part of a team. And you have a team of 3 to share the task loading. That's rare and valuable.
Novices are exactly who should be taking the class. I give detailed reasons for it in my second book. SCUBA: A Practical Guide to Advanced Level Diving.
Not only will it help to recognize problems with others, but it will also change how you look at your own dive planning and preparation. Too many divers do not recognize and are not told just what the activity is.
Shops and instructors are afraid of scaring them away.
Below is what I told every student before I took a cent from them.
"SCUBA is an activity that takes place in an environment that is normally hostile to human life. We don't have gills so we rely on mechanical devices to keep from dying. It is not a question of if those devices will fail, but when. So you need to be ready for that.
It is an activity that can be fun, entertaining, educational, exciting, and if done within the confines of your training and experience- safe. More or less. But go outside of that too far, too fast and it has the potential to kill you in some very creative, nasty, and painful ways."
Taking the rescue class will help to identify those times when you might be getting close to your limits. Or when a so-called "professional" is taking you close to them. It will give you the tools to evaluate this and say, "Nope, not today" and end the dive.
I also told my students to NEVER trust a DM or Guide to keep them safe unless they specifically hired them for that purpose. Group guides should never be relied on. That's not what they are there for and it;s unfair to expect of them.
Take the class. Now.