"What are you going to do, follow me around and wait for me to die?" he says, as amused as he is confused. And yes, he's lost and alone and Jack's got that right enough that he doesn't bother verbally clarifying it - silence can speak volumes and this omission is not an exception. "I'll take the 'big responsible boss' as a 'yes' to the genuflection, by the way." There's a smile there with that, though. Faint, but mostly -

Belatedly he realizes that Jack was glancing at the gun - or looking at it. He glances to it, then back up at Jack and gets it. "Company would be good." And yep, still got a hefty dose of fear of death, more than. What he isn't is a coward. Not anymore. His own words to the Doctor -'better off a coward' - echo in his mind. "You'd better be really sure."