"Just how safe do you think it is for the buddy to approach and attempt a rescue of the panicked OOA diver?"
I don't think it's safe at all.
I don't think it's safe at all.
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Please note that in the scenario both divers are OW certified.
Once they are in "full blown panic" all reasoning has stopped. In your scenario, its unlikely that being 20 feet away you will get to them. They will already be on their way to the surface most likely extremely fast.
Or ... should divers be trained to the point that they could reasonably handle a situation like that?... Neither should be in a situation like that.