Amari willingly parts with the trappings of her former life in order to aid Zélie and her cause, which Amari believes is the right thing to do. Zélie has great respect for those who can fight. Because she did not respect Amari, Zélie assumed Amari was physically weak. To the contrary, she seems to be adept with a sword, which earns her some grudging respect from Zélie.