Rereading ch. 15, there's one issue that really hit me: Kallen is flanderized here in her hot-blooded tsundereness down to pseudo-jerk sue levels. While Lelouch can be very prideful, I thought she was overreacting, and that Lelouch was just being straightforward there. Besides, there weren't really any moments like that between them when he was leading her. Infact, for her, Lelouch as Zero was what helped keep up her morale, and the one person she would die for.