I'm going to cross-post the editorial notes from the website because I think they might be needed here:
Oh geez, that’s a really dark set of dialogue. I may consider changing it. Anyway, the only reason Raven is mentioning killing them both is because she’s imagining the horror of cosmic things beyond human knowledge, because those are the sorts of things she would fear. Raven would never suggest giving up for a simple poisoning. The toxin and the damage caused by her exposure to Snowflame are making her act not like herself.
Also, yes, she doesn’t know Batman’s true identity in this story. I think Bruce considers her too much of an unknown to trust telling her, at least yet.
I think you know who’s coming next update… I hope he lightens up the mood..D:
Official site is here:here.