It would be gauche to laugh, but Louis feels some desperate spark of healing amusement in the gloom. N'Awlins. Sow-rry. There's comfort in the ghosts of their long lost homes. Louis thinks Fraser is thinking of home now--and of course there is the tamping down of that emotion, can't fall apart in front of a stranger, Louis knows that so well...

"Not goin' waste a good man's time with my moanin' about the cold, not when you had to be diggin' this frozen ground. I was... unable to help."

It's his turn to look at the ground. Is he sorry? Is he embarrassed about not being able-bodied? Did he shy away from dealing with the dead despite attending the autopsy? Was he ill? Lazy? This is one of those moments where Louis deliberately lets someone assume things about him. He can't possibly tell Fraser he's allergic to the sun.