Hezenkos is only in this for the data, something about a ritual she wants to complete when it's over. [It's not hard to believe. The woman treats them like Singed treated his rats.]

For whoever is pulling the strings, this is the ritual. They said I was to help them find a vessel, ensure the 'game' ran until only myself and one other person was left. Then they would take the body of the last survivor and give me what I needed.