This is one of my biggest questions. Is he going to give in? Duke has evolved a lot from the first episodes (best character development) and even his relationship with Nathan has improved (because despite learning about Duke's fate, he's tried to prove Nathan and Audrey that he can avoid it). Yes, he's changed for the better but his fate is clear: he is destined to make the troubles disappear even it means killing people who never asked for their trouble. Duke feels the need and the pressure to kill this man whose trouble was, in my opinion, the creepiest one so far, in order to free the rest of his family from their terrible future. You might think Audrey made him do it, but it was his decision.