It is a metaphor
A figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable.
the following key ideas correctly express the key sentence.
restate key idea: most people can learn to swim in ten short lessons.
restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.
restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.
restate key idea: first aid is to prevent accidents as well as assist in rescue.
explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).
note the usage of names and pronouns, "james" & "the old man". this alone can confirm it as third person, as first person uses "i" and the like, while second person uses "you" and the like.