Did you see the sneak peek of next season? Aslaug talks about wanting to be the only queen, which means she might be planning on going after Lagertha.
I have a feeling THAT will be the last straw with Rangnar, and if Lagertha doesn't do it, Ragnar would kill her himself.
No, I missed that. When did they show the sneak peek? Asalug is a snake in the grass; can't trust her any farther that you can see her.