Wow. Just wow!...
Interestingly, the critical Team Instructor 2 gives an example of Instructor 2’s training element, where he makes his students pass out on the floor by giving them a hypoxic breathing agent in the loop, so that they can learn how hypoxia can ‘switch you off’ without a warning.
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If you decide to deprive yourself of oxygen and experience the effects, that's one thing.
If you deliberately deprive your students of oxygen (considering the fact that an instructor is authoritative to students), it is criminal. Instructors are not anaesthesiologists who have the knowledge to determine the (long-term) effects of hypo-saturation.