[Undine has hidden depths, especially in a game with batshit crazy people like Junko. She can keep her head down when need be.

Though she'd rather not take out whoever is left, but she's not telling Vanitas that. And it's for the exact same reason: keep her head down, do what's expected of her, and she will survive.]

That works for me. Let's wait at least two more trials before we do anything, to see what happens. It's a bad idea to try anything risky without any information.