[A glance back confirms that it's more than just the new situation that's bothering her. She arrived her in the midst of something big. However, it is not John's style to coddle anyone in a rough situation. So his response is very blunt.]

We all have our own problems waiting for us back home. But we never get much of a choice about when and how things will happen to us. For now, you have to keep your mind in the present.