In this example, the overseer, in order to make sure of his job, must be as tough as the owner—and more so.
So because the oppressed are tied to the oppressors, they are given a skewed idea of what it is to be a "man" (or in this case, what it takes to have complete autonomy). Because they risk of returning to be seen as the oppressed in the eyes of the oppressors, they will work hard to remain on a balance field (or what they mistakenly think is a balancing playing field) with their "masters."