I'm pretty sure it's a fake out, at least when I last played through what was available there was a scene it seemed like there was someone was following grolokk, with what I think happen is she faked her death, at the hands of the orks so you as the pc would clear the way without her obvious involvement and to avoid having to do sexual things with him. I mean, I assume that's what happened, as just moments later you are a character with a single new partner mage manage to completely clear out the camp if you want to. Which makes the whole thing odd as she seems to know more about the area than your character and fight partner do.