She didn't know anything any this man, only that he was evil, and that he'd hurt her if he has the chance. It's why he was chosen. So when he pulled the knife, she isn't surprised. She'd expected a threat, some kind of power play. The fact he'd done so only cemented that they'd chosen well.

She could try to fake fear, but it would come off hollow. So instead, she let herself simply be cautious. After all, she doesn't want to get cut. That's true. So she puts her hands up, that universal sign of 'don't hurt me', and leans away from the blade, pressing into the wall.

"You don't need that. I won't scream." Is an effort to not look at Lestat over the man's shoulder. She doesn't want to give the game away.