Jack thereupon turned back. Duffer followed him. Jack began to run, and then Duffer began to run. Jack went tumbling over the fences, and Duffer went tumbling over the fences after him. Jack ran for liberty at first, but soon he began to run from the whip; while at each moment, as he gave signs of failing courage, Duffer’s rage and thirst for vengeance increased; for nothing so excites the valorous fury of your genuine bully, as the appearance of faint-heartedness in a foe.