There is no weapon that compares to time.
It not only ages a person's body, erodes their spirit, but most importantly, it always manages to change human cognition.
Shadow felt that this was perfectly exemplified in Langinus.
The Langinus of the moment had long transformed from a resister to a believer in fate, which was why he came to District 17 alone, determined to die.
Perhaps in the last phase of his life, the believer in fate still thought that his death could bring about a change for the United Government and even the world.
However, the truth is often cruel; everyone walked on the path laid out by fate, and every "change" was nothing but fate's sleight of hand, which is the very truth of the "justice" ability.
What people call luck or disaster, both are guided by fate.
Shadow could have chosen to end Langinus's life while he was preoccupied with the Bug Swarm, but he did not. Instead, he stood by Langinus as an observer, appreciating the direction of the battle.
