Join Date: Feb 2010
Location: Narragansett Bay
Thanked 299 Times in 282 Posts
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I don't see any confusion whatsoever.
A man in the water can't swim forever, or stand the heat loss. Every minute is one closer to death if not retrieved and you might lose sight of them.
An amputation most certainly could infect or bleed out, so I think the guaranteed survivability in your example is what is confusing the matter. Unless you were able to treat aboard, that would be a Mayday.
You claim that urgent requires immediate attention and assistance. I will have to pull the text, but I didn't think Pan Pan meant you needed immediate attention, but will need assistance.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.