Elijah made the first move. Through Reuben’s good judgment he identified the guard with the most influence with the other guards. One who has resisted the despotic bent of the prison’s commandant. And no longer kowtows to the creeds and dictates of the world government headed up by Stan.
By the end of their meeting Elijah gave Magwich what he most desired, the removal of the mark.
At this change of status he immediately offered himself to his brother guards for incarceration.
This they refused to do, instead they joined him.
The word spread throughout the prison and the commandant finding no one left who was aligned with him, barricaded himself in his office (and his despondency) and hung himself.