Did you forget to say that this question is about “HELP HIM UP!”: A WITNESS’S ACCOUNT OF PANIC ON A SUBWAY PLATFORM "
Answer and Explanation:
The author uses a descriptive structure to present the situation that was happening and the reaction of people to that situation. In this way, the author uses a descriptive structure to develop the ideas that people tend to be indifferent to the problem of others.
This is because the author describes the moment when a homeless person fell on the metro tracks and how few people bothered to react to him, but they cared to see what was happening, just out of curiosity.