What sound device is used in the following excerpt from "how the animals lost their tails and got them back traveling from philadelphia to medicine hat" by carl sandburg?

when there was a fight and a snag and a wrangle between two families living next door neighbors to each other and this old flongboo was called in to umpire and to say which family was right and which family was wrong, which family started it and which family ought to stop it, he used to say,
“the best umpire is the one who knows just how far to go and how far not to go.”