Understood. I think part of the training and the stated expectation is that you are trained and enabled to know where to go and how to review standards. The IE exam is open book since it is not expected to memorize standards, but know how to find them.
From what I have read, the instructor broke enough of the basic and rudimentary standards that trying to claim “how was she supposed to know these other standards” will be a pretty heavy lift. Just my opinion of course, no experience or knowledge in this situation or in legal proceedings in general.
One of the weaknesses I think of IDCs/IEs is that you really are not taught to teach. I had to learn how to manage student comfort, deal with both cold water and cold temperatures topside. I would never teach in snow conditions, though some local instructors do. It is too much suffering for students and stress/feeling cold/miserable is not conducive to learning/maximum performance.
When I first started teaching at a shop (now out of business, surprise, surprise), students were in wet dry suits. What's a wet dry suit you ask? A dry suit that doesn't keep water out. One time a student had a hard ring in his dry suit, so I gave him my marigolds for his hands. At the end of the dive, the only thing dry were his hands. But I digress. For those in wet gloves, I'd have a big water container where I'd put boiling water in the morning and they'd throw in their gloves/hoods in between dives so they wouldn't suffer so much.
I do think when there are so many factors of teaching at elevation in winter, a bit more than read the standards is sufficient, as you need to put in several standards and practices not covered by standards. This is a perfect storm situation where bad weather, cold temperature, lack of common sense all came together resulting in tragedy.
I wish agencies would have some sort of apprentice period where how to approach teaching various courses is covered, and in order to teach a specialty, you would have to have to teach under supervision your first time out.
Don't think I'm excusing Snow here. She was certainly negligent in how she weighted the student, allowing a student to dive without a dry suit hose, not having an orientation session at a pool, etc.. My gut tells me that she was pushed by the dive center to get the classes done and just couldn't handle it.