What if trying to "save a life" utilizing these methods actually costs a life? This is a good example of well intentioned advice from [edited for political correctness].
It's just my opinion, not advice.
So, let met get this straight; You are concerned that if you tell someone to cutaway the main, the wrong student will respond and die because of it, right? I can agree that this is a risk.
But that is a risk you need to weigh against the risk of the student under the malfunctioning main dying. I think an instructor has experience enough to make that judgment call. Maybe only yell 'cutaway' when all students are up high enough?
What bothers me is that, reading this thread, I get the impression some instructors would sooner let someone die than break their 'don't yell cutaway' rule. I expect instructors to use their judgment, not follow rules to cover their ass.
And [edited for political correctness]? We're called 'beginning skydivers', expect to see a couple more of us.