Rion obliges, of course, as ...that's kind of what he was getting at anyway, and opens the door. so as to not make Cain any more nervous than he is, Rion is the first to step in, telling Cain to close the door behind him.
vaguely, Rion is aware of his hair standing on the back of his neck, somewhat fearful of an attack from Cain, showing his double his back—even given Cain's word, there's just still that anxiety.]