The dialogue options available in this scenario to Zeshuck and Eisendel would be determined by the skills of their characters and some randomization. "You can either agree or compete on what game dialogue you want to have and what direction the story goes. Because at the end of the day you are making a decision on whether I'm going to kill the captain or save the captain that's a dark side choice, Erik doesn't want that. It's neat to have that potential interaction."
Hat tip to Chillinvillain.