Which literary device is the term sield-bosses

What is the central idea in this advice from branch rickey to jackie robinson?  

Read the excerpt from "the most dangerous game." a man, who had been hiding in the curtains of the bed, was standing there. "rainsford! " screamed the general. "how in god's name did you get here? " "swam," said rainsford. "i found it quicker than walking through the jungle." the general sucked in his breath and smiled. "i congratulate you," he said. "you have won the game." rainsford did not smile. "i am still a beast at bay," he said, in a low, hoarse voice. "get ready, general zaroff." the general made one of his deepest bows. "i see," he said. "splendid! one of us is to furnish a repast for the hounds. the other will sleep in this very excellent bed. on guard, rainsford." . . he had never slept in a better bed, rainsford decided. adrian is writing an essay about "the most dangerous game.” which detail from the excerpt best supports his idea that rainsford is unchanged and still feels that the hunter is justified in killing the hunted? a man, who had been hiding in the curtains of the bed, was standing there. "swam," said rainsford. "i found it quicker than walking through the jungle." rainsford did not smile. "i am still a beast at bay," he said, in a low, hoarse voice. "get ready, general zaroff." he had never slept in a better bed, rainsford decided.

According to the study, what made jonathan swift distrust the assumption most english people of his era made about the superiority of their own race and culture?