I'm surprised that a dentist should be expected to have an in-depth knowledge of asthma. Pardon my ignorance, but do all dentists receive a solid foundational knowledge of respiratory illnesses? I did not realize that was the case.
All medical people have to go through basic classes of anatomy and physiology. A dentist would get far more extensive information on the upper airway. Asthma is a very common problem. Anyone one not knowing that asthma is a disease with a breathing problem, up to and including life threatening has to be living in a cave. A dentist that would not have a reasonable grasp of asthma and the issues involved in diving shouldn't be practicing medicine IMO.
That said, this case ultimately will hinge on the selection of the lawyers, and how the lawyers select the jury. THEN they take all this confusing information and try to sway the jury to their particular point of view. The jury in ALL cases is a battle to select individuals that the lawyers deem will be mostly to their point of argument. The final jury is "supposed to be neutral" but they aren't. They will come in with a bunch of predetermined prejudices about legality, personal responsibility, corporate responsibility, sanctity/value/importance of life, and bunch of other considerations. The lawyers then try to influence these prejudices using the so called 'facts' of the case.
If this goes to trial, it'll be at least a month long, if not longer. Should it not be settled before or during the case it looks to me like this one will have responsibility parceled out to a number of people. There were a LOT of screw ups on this one. In my own opinion I'd call the Dentist 70% responsible, but the instructors had some clear warning signals they ignored, and the Dr. that signed off on this is surely sweating bullets.
(Note - I was a juror on a similar type of outdoor recreational athletic case where a young boy died. It wasn't diving but I think that doesn't matter. If the lawyers had known I had been a diver for 20 years and president of a dive club for 4 years they would have thrown me out.....but they didn't ask, and I didn't volunteer. I wanted to see how it went.
It absolutely was a tragedy. But I never saw how the corporation getting sued was responsible at all. When it finally came down to the jury arguing about it we were split 50:50. The ones in favor of the family were not active outdoors and never had been. They were also of the opinion that if a child dies SOMEONE has to pay. None of the people that were active outdoors people could remotely understand where they could possibly get his idea. See where these already established prejudices come from?
Took 2 weeks of trial, and 2 days to settle a case that should never have come to court. Since it did the jury deliberations should have taken about 15" as far as I'm concerned.)