GTE,
I cannot fault your actions/reactions with regard to the airborne malfunction, however with regard to your first aid course examples, while they fit your narrative I believe the second instructor probably acted more professionally.
The question that must be asked was, did the student 'casualties' give informed consent to be used as teaching aids in those scenarios? The instructor who took the student out of the class and then maintained clinical confidentiality to a 'patient', would perhaps be recognised by health professionals as having dealt with the matter more appropriately.
As previously stated, I agree with your narrative, but perhaps not the iron clad example to support it.