Answer & Explanation:
The author is asking himself questions that are helping him describe and develop the story. ''I remember one particular event. It was when?'' Then he is describing the event by answering his question. ''Should I offer my help? Should I take care of the girl and the boy, take them by their hands until they reach the end of that steep long concrete stairs?'' With these questions, he is allowing the readers to see what was in this mind when he was facing the situation and with that, the readers can see how the author was feeling. ''Suppose I approach this white lady in this deserted subway station late at night? What would she say? What would be the first reaction of this white American woman? Would she say: 'Yes, of course, you may help me,' or would she think I was trying to get too familiar or would she think worse? What do I do if she screamed when I went to offer my help?'' This is where he is giving the readers his point of view and we can see that he is scared by the situation between white people and Puerto Ricans (like him).
Hope this helps ;)