Let's get you into the fresh air. Was Kay in character saying it to Cassian's cover, or just Kay saying it to Cassian…? Well, the best lies were built on the truth. Cassian let himself, for a moment, feel what he was feeling; lean too heavily, bent forward over himself, on Kay's arm; breathe raggedly and impatiently wave off anyone who even got into his peripheral vision; and let Kay guide them both to his choice of exit.