The question is the same if inverted in a Manichean form: how can Voldemort and his wicked forces have such power and yet be unable to destroy a mild-mannered and rather disorganized schoolboy?
The question is the same if inverted in a Manichean form: how can Voldemort and his wicked forces have such power and yet be unable to destroy a mild-mannered and rather disorganized schoolboy?