During that time I came to fully understand the point made in the post I quoted above. If a diver is in trouble and needs someone to tow him or her to safety, it is not the time for a DM who can't handle the job. I was glad I had done the extra work in preparation for the course, and I continue to make sure, even though I don't do any actual DM-type work, that I am capable of bringing a troubled diver to safety.
I've always been a strong swimmer, and got 5/5 on all the stamina tests, but I can tell you the first time I had to jump off a boat in response to the captain yelling "Holy s--t, holy s-hit! Diver up. Non-responsive! Get in the water! Get in the water!" I got to see that a mere 100ft out-and-back swim in 4' swells and current towing an honest to goodness non-responsive diver in doubles, drysuit, etc, etc, is a lot more work than you can imagine during any sort of "stamina exercise" or "rescue scenario."
:shocked2: