The implication takes a moment before it fully hits Anders. Justice has a living body, which means that he has everything that comes with it. Justice has to eat, sleep, and all that. Justice has done all that through Anders, or at least watched through their eyes, which will hopefully save some trouble.

Anders doesn't dare let go of Justice yet. He wants to keep hold of the spirit for as long as possible, as if he can make them merge again by doing so.

"Maybe we can build a boat or something, and sail away." As if either of them know how to make a boat. "And maybe we should check out that lyrium situation while we're here."