Who does roger nearly push at the end of the book? What does this say?

Although he is not as clever as Jack, Roger knows when he is being abused and humiliated. Near the end of the book, Jack publicly admonishes Roger for not keeping proper watch. Rodger walks past Jack slightly missing pushing his shoulder on purpose. If Roger were to strike out at Jack, Jack's tenure as chief would be over. With the Alpha-boy defeated the boys would quickly turn on each other. In his own plodding way, Roger holds the balance of power.