Milkit broke through her conditioning! She overcame the hurdle of the trauma that kept replaying in her head to tell Flum what she needed to hear. Blew the gray clouds of doubt right out of her mind. You love to see it.
That's right, Cyrill might be THE hero, but Flum is Milkit's very own hero. She didn't need to be THE hero to save someone, and being there to save that one important person in her life is all that really matters.
I got a feeling that what awaits Flum behind that door isn't going to be as nice as what happened between her and Milkit...