What is the author's style in Here I Stand: a Life of Martin Luther by Roland Bainton?

This is a scholarly book written to shed light upon Luther's influences, motivations, reasoning, battles, triumphs, and perseverance. The author writes to show why Luther did what he did throughout his life. The book does contrast Luther's beliefs and actions with those of his opposition. The author portrays the struggle of the Catholic Church against what they perceive as the heresy of Martin Luther.