Chapter 11: How do Jack's savages treat Sam and Eric? What is the significance of the fact that Roger "edged past the chief, only just avoiding pushing him with his shoulder"?

Roger, in particular, just wants to torture the twins for the fun of it. Jack admonishes Roger publicly for not paying attention. Roger may not be clever but he does 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.