If there were any lasting problems, Jack is tight lipped, but death is a long time friend of Harkness. Living forever, living through history, and seeing the horrors and wonders all at once have left him sometimes feeling numb. The feeling of coming back is where the horror begins, with the feeling of being drug over broken glass.

"Hey, if you ever need a hand, I'd be more than willing to put on one of your uniforms and go on a mission. I've got plenty experience with how things work out there in space."

Jack offers with a smile forming on his face. It isn't that he wants to leave Gwen to deal with everything on Earth, but the yearning for the stars will never fade.