I felt like I could accept Azuls becoming Briasers servant as shes an natural M. But Braiser still holds some of her ideals of magic girls I guess. Maybe it just felt to easy for her, maybe she wanted to break her by breaking her, not her giving up :/shrugs
Tbh, i think it would be better if she just kill azul there, she's dissapointed anyway, just kill it,and it would be a better character development for the magical girl