I'm still of the opinion that Emily isn't even into Marten. She was just being her strange little self. Likewise, Marten showed no inclination toward her at all. In my opinion, she doesn't even come into the Claire/Marten equation at all, and if this goes ahead? I'll be incredibly surprised if there's a moment where Marten says they should stop and think about Emily's feelings. I guess I've always thought it was established there was nothing there for either of them, and in my mind, the whole "situation" with Emily was to settle into mind the idea of Marten dating an intern for other characters, i.e. Faye and Tai. Since they took it so easily about Emily, that might be a setup to that particular hangup being removed -or at least lessened- for Marten when it comes to Claire.
If any of that made sense outside of the cramped, spooky confines of my mind.