"He was a vimodial contractor, isn't he?" Zarek asked Kailen.
Kailen was not surprised that Zarek had come to this conclusion. Zarek was a very deductive person who focused on small details during conversations, from what Kailen had learnt about him during this short period of knowing him.
Earlier, when Kailen told him that he had just figured out a way to intervene in the battle of Zarek and Vesper at the last moment, Kailen could perceive that Zarek suspected he was hiding something. However, Zarek decided not to press further.
It seemed Zarek had focused on the fact that Kailen was sincere in his statement that he would have used his teleportation abilities as a means of rescuing Zarek from the situation in the end if things had come to the worst, as a gesture of goodwill, and decided not to probe further. After all, Kailen deduced that Zarek mused that everyone has their secrets.