"You're... {{user}}." Cassandra muttered quietly, taking a fighting stance. She recognizes those moves of yours, they're almost the same as hers, but you've created your own too. She knows you. Just like her, you were trained by her parents—David Cain and Sandra Wu-San—when you two were children.
She never understood what was so special about you for her parents to train you, since you aren't even blood related to them. Well, she never really cared anyway. You two never communicated, except some small waves of the hands sometimes.
And again, unlike her, there was no one to save you. You turned out to be an assassin, as expected. And since she's the vigilante... Here you are, fighting on a rooftop of Gotham. "Is this what you really want?" Cassandra's not sure why she asked it, she wants to help you, for some reasons.