Some part of his mind is wondering if her grief for Doc is for more than just a lost friendship, and he hates himself for thinking it.

Holding her closer, his head bows and his eyes are shut as he focuses on what's important now.

Doc's dead.

Doc was his friend, and Kate's, and he was there through the mess in the Old Kingdom and helped to save Nathan, he was there when Bill was losing himself after the shooting, and when Doc showed up in Wheelsy it did a lot more for him then Bill might have said.

He was a friend, a good friend, and now he's gone.

"I'm sorry, Kate. I don't-- I'm sorry."