Napoleon is a boar in the novel “Animal Farm” which is written by George Orwell. In the novel, he has been described as a “fierce-looking” boar who had the lust for power. His physical appearance of being huge and fierce made other animals on the farm to follow his commands. He combined his propaganda of “getting his own way” with terror and fear which led the other animals to fall prey to his dominance. After gaining power he rules the farm in the way he wants it to be.
I think it because Kevin think one of there promise might affect there friendship (or other relationship) while doing a quest so that is why Kevin say it is ok to break a promise