At the beginning Tieria had misgivings against Setsuna, and even threatened to kill him if he jeopardized the mission(s). After the introduction of the Throne Meisters, due to a common dislike towards them, they start seeing eye-to-eye and they have renewed respect for each other. In season 2, after their reunion, they share a renewed relationship of trust and respect. Tieria even supported Setsuna's rescue of Marina Ismail, something that would have been impossible in the past. During the movie, Tieria maintained his faith in Setsuna, believing him to be a critical component of the "dialogues" that Aeolia Schenberg had predicted would take place between humans and alien life.