[@Double]

The reason I brought it up is that her experience and or fighting skill isn't necessarily that of a Rookie. The lines are a bit blurred because of her Keyblades power. Example, if she were to sync with Cyrus than her fighting skills and style would match up with his as well as any weaknesses that he might have even be it small to large. I can see your point that most don't seem like they could or would kill another. Bellasiel might be influenced in a sync but she would still be more for trapping than killing at this point. If it meant another person she cared about life though, I could see her making the choice to kill the attacker and not worrying if she died defending either