Who or what is the antagonist in "the colomber" by dino buzzati

The two essential parts of the sentence are the: a: subject n verb b: subject n noun c: adjective n verb

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.

Read this excerpt from "the bear." he is in his grave, and i have buried myself between four walls. . we are both dead. what is revealed about character in this quote?