I'm expecting them to tell him to kill the girl as a sign of good faith/loyalty. Which he will, of course, refuse.
Not taking no for an answer. They'll kill him and her, triggering a reset. This will alter his plans, realizing the guild will not meet his expectations. He'll likely then , "run away with her" when she gives the option.
Honestly, I felt the berserker was too spot-lit to not become one of the 'sidekicks'. So with a reset, it'll give us a chance to see more of her senario.