What is ironic about white fang’s condition

Which three parts of these excerpts reflect the idea that war affects not only the minds of the combatants but also their physical reactions?

Why does the host answer the guest with brief responses during the party?

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.