Well, the narrator doesn't really "know" anything--it's an author's construct, nyet? If we envision the narrator as a character--and I'm not sure we inevitably do that with omniscient--then we'd probably envision her as existing after the events of the novel, like we do with a first-person narrator, so there'd be no precognition necessary.
After all, even if it is from River's point of view, there's still a narrator in some sense, as its told in third person, and the narrator "knows" what River is thinking, but it'd be odd to say the narrator is psychic.
no subject
After all, even if it is from River's point of view, there's still a narrator in some sense, as its told in third person, and the narrator "knows" what River is thinking, but it'd be odd to say the narrator is psychic.