I have yet to watch this video, but it has been going around and around for a couple of weeks now.
Bottom line is they did rescue the victim alive. Ultimately that is your goal. Were they in over their heads? Evidently. Hopefully it gets them to take a course and get some formal training. It really does help. If they had some basic education, this accident may not have happened in the first place. Which is what you want to happen every time you go out. Once you are in a rescue situation, you have done a lot of things wrong. Then the rescue becomes your last chance to avoid heart break. Not recommended to get to that point.