He holds on and he doesn't let go, not until of course the other doesn't need him. The first dead was the worse to get a grasp on. "If you don't want to make a habit of it don't." Jack's not the only fixed point roaming this universe and that one is a well kept secret.

The worlds Jack used weren't the best and perhaps he's become used to it or just cold to the entire thing. Still he holds onto the other, hugging the man to give that need of comfort that he never got.

He feels the other Jack shake and he watches his color drain from him. Still he holds on to him, its something Jack knows that can provide some form of comfort for him.