Kai watches him for a very long moment, much longer than he should when duty and rationale tug at his heart, but then it's long after Ryoji's form has faded, when Kai is staring into an empty sky, and he needs to prepare for Queen Levana, needs to be able to focus on the coming crisis.

Even if he can't -- will probably never be able to -- get thoughts of Ryoji out of his head.