The perspective in “one minute longer” switches between wolf and the boy throughout the story. how does this affect the story ?

In "One Minute Longer", by Albert Payson Terhune, the switch of the perspective between wolf and the boy throughout the story contributes to create suspense and to build dramatic tension in the story.

Switching perspectives is a literary device mostly used to create these effects that contribute to make the story more dynamic and thrilling.

mark twain, real name samuel langhorne clemens, was an american writer, humorist, entrepreneur, publisher, and lecturer. among his novels are the adventures of tom sawyer and its sequel, the adventures of huckleberry finn, the latter often called "the great american novel". wikipedia

remember, the goal of an adjective clause is to add more information to a noun or a pronoun. as you can see from the examples above, you can add information by including a longer adjective clause or tighten up a sentence by turning the adjective clause into an adjective phrase.