Espied

A boy was reading a book on stairs,
which was not coated by cement, didn't have a handrail.
Suddenly had a question, closed his book with pointing finger.
A six feet 5lx2b shape wooden stick has many nails, leaning on the wall.
A crow came and seated on the wooden stick had eye contact with the boy.
Suddenly, flying over his head, drinking the floated water on the roof. Flying over him, the boy had a smile and eye brightened.
What would be the question he had?