I've seen a number of students fail the arm sweep in the pool, and persist in doing it, and getting more and more anxious. Peter DOES brief people that you have TWO regulators, and there is no law saying you can't use either one of them if it's convenient or necessary. Once you pick up the octo and show it to them, the light goes on.
I prefer the bungied backup system, myself, but it was not what I was taught on.
I prefer the bungied backup system, myself, but it was not what I was taught on.