By killing her mum in a mercy kill, she's doing exactly what the Ghoul did to Roger. She's learnt from him. She has turned into him. When she said, "I'll never be you," maybe that's not true. And in that moment, when she shoots her mum, it means so many things. It means 'I'm coming with you.' It means. 'I f*cking hate you, but I have turned into you, you were right.' It means she's letting go of her golden centre.
I want the audience at the end of the show to wonder if their hero is still a good person. I don't know who she's gonna be in season two, but this is what happens when you break the unbreakable. I don't know who she's about to become. [...] I'd be down to play it either way.
- Ella Purnell (x)