If you want to give a DMC stress and a problem to solve, have a diver surface spit out his reg, splash around, then silently drop back down without a regulator and see what the DMC does.
flots.
That scenario is covered in Rescue Diver.
I agree that the gear exchange is a largely artificial, but what would you suggest to replace it with? Keep in mind that the goal is to be able to asses whether a DMC can work comfortably and methodically, through a series of tasks, underwater, with another diver, while ensuring that both have access to a single air source.
I'm interested to see what you come up with.
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