[For a moment, he keeps looking at Sebastian with squinted eyes, before he comes to the same conclusion -- this demon, while unquestionably a demon, doesn't quite have the same... flavor, or stench, or whatever you'd like to call it, as the ones back in the world he knows.]
... I see.
[Then, the logical conclusion:] You can't return. [Either. He's cut off from Heaven, too, which, granted, puts him far away from Raphael but is also Very Bad.]