Perhaps if he had been looking at her harshly or timidly, or if one undecided line had marked his countenance, she would have rebelled, and the lesson had ended there and then; but he was only awaiting her compliance--as calm as marble, and as cool. 
Perhaps if he had been looking at her harshly or undecidedly she would have rebelled, and the lesson have ended; but he was as calm and cool as marble. 