The poet has described everything and narrated every happenings from a doctor’s point of view. May be, this is because he wanted a narrator who is a learned person, can realize the need of the situations promptly and handle minor injuries. But it was actually a destructive atomic explosion. Even then, the doctor had the sense to identify Magnesium flares, and go to the hospital without delay. Probably a common man couldn’t handle all these well and even could not narrate the events. That would seem very awkward in that case. This is why the doctor’s character is chosen.