“How long are you going to stay with me?” “Forever.” “That’s what I thought. But then came the army of ghosts; then came Torchwood and the war. And that’s when it all ended. This is the story of how I died…”
they both had to laugh, because they know that unknown, the monsters, the running is the best part. No chance is either of them going to give that up. No way they're just going to ignore whatever is going on here.