I may be overthinking things but I think that Eva shows how crude Nika can be. Sure, he is just poking at her because is funny, he is not trying to be mean to her, but he is joking with a sensitive topic for her. He is not a psychopath anymore but he still is kinda of a asshole. He does not think how the joke will be taken by Eva, he does it because for him is funny get under her skin. Bella needs to call him out on it, because he is being a jerk. I do like the banter and maybe I am a jerk too because I do find it funny but I don't blame Eva munch for it. She is a lot taller for what I remember but might be high heels, I think she will come to accept him once she sees a good influence on Bella.