"...of running children in a nightmare heat..."
This represents children running during the war that is something terrible represented as a nightmare.
"In his darkroom he is finally alone..."
This represents a dark room with a child that is alone.
"The reader´s eyeballs prick with tears."
"From the aeroplane he stares impassively at where he earns his living and they do not care."
This means that someone is looking how the city or place is destroyed.
"..... the blood stained into foreign dust"
This menas that there are so many people dying and being killed that seeing in the floor is like an everyday thing. Nos it´s normal to see blood.
