The 100 returned tonight after nearly a month away, and it brought with it a chance for survival. Much of Ravens interactions in tonights episode were with a hallucination of Becca, and it was that hallucination who suggested this plan to Raven in the first place. I think Becca, as much of a hallucination as she is, I think shes an actual manifestation of her true hearts desire that Ravens been protesting for a very long time, or not allowing herself to indulge in, she says. Ravens decision was made all the more sad by the fact that the only person she got to share a goodbye with was Murphy. But in Ravens mind, shes just taking up space and taking up air in that bunker and is going to be a vegetable as the best case scenario, and thats not how she wants to live her life. And I think because her and Murphy have such a unique dynamic, he respects that. Of course he is sad and doesnt want her to do this. But he respects her decision because this is her life and its what she wants as her last dying wish.