Answer:
"Andrew says this because he had been able to keep his promise given to Joe Morgan; he had been able to save Mrs. Morgan as well as his newly born baby after it had been born lifeless. It means Andrew felt contented and jubilant at his own efforts and the achievement."
This line comes from "The Things They Carried" by Tim O Brien when he served in Vietnam. The term hard vocabulary to contain terrible softness simply reflects what he has done to serve in Vietnam. In times of war, it is not good to be internally soft as it may serve as weakness to enemies. Therefore, hard vocabulary refers to the words that one would say to himself and others in order to project strength and hide softness or weakness inside.
The answer is:
He becomes less concerned with correct behavior.
Shakespeare´s Hamlet narrates the life of Prince Hamlet after his father the king was killed, Laertes kills princa Hamlet thinkin he is risponsable for his fathers death, in this way he grows to be less concerned with correct behavior given the fact that he kills him with a poisoned sword.
