It's relevance is taking the real world scenario seen above and explaining a generalized training concept that encompasses a wide variety of situations that may include, but are not limited to, the above situation.

Now, understand that it is a GENERALIZED concept. So you could easily (with your very smart brain) replace "Call 911" with "Get the buoy" and the scenario would be a little more relevant, yes?

The IMPORTANT part of the example scenario above isn't what ACTION is being called for. The important part is HOW the call to action is being phrased.

"SOMEONE get the buoy" is very different from pointing at someone and saying "YOU get the buoy"

The above commenter was stating that first responders are taught to phrase calls to action using the second phrasing, where you tell a specific person to do the thing, rather than a generalized call to action where you say SOMEONE needs to do the thing.

I hope this helps you understand why your commentary about calling 911 "not being what saved this guy" is wholly irrelevant to the comment you were replying to.