I lowkey love how they portrayed Avril's feelings about Corina. She's lived with Corina for several years and got used to being diminished and mistreated. It became ''her normal''. She's grown apathetic to Corina and her doings. The fact that she feels no anger or resentment, but just apathy, is somehow both amazing and worrying. This is how traumatized children/adults might react to bad treatment and those who mistreated them.
The fact that what worried Avril more than being tied up was Corina's plan being full of flaws, and even tried to tell that to her, shows how much she's been used to this.
It's rare to see a series portraying some sort of apathy as a way of mental selfdefense, but I love when it happens. Even tho this series didn't really go into the psychological aspect of it.