Swamped

"Oh, it's Cassandra's fault, is it? Do you really think that, had it gone the other way, had it been you hurting her - do you think it would have fixed anything if she had taken this path with her life? Would you feel defeated, to see her leading a miserly life of misery? Have you even really gotten revenge?"

"She's out of my life!" Mackenzie shouts. "She's gone!"

"And yet, the moment I go poking around, you bring her into the conversation. You can't be rid of her any more than you can be rid of me." Inspiration suddenly strikes, and you draw the knife you grabbed from Mantis. "Or would you like to try it? See if you can fight off who you used to be."

Now he seems surprised. This is probably off-script, but it's off-script in a way that you can hopefully use to create a disturbance, and maybe get off this stage.

Though you don't get much of a chance to think about how to do that before something else demands your attention.