Talk:"They"

If "they" are the Orz, why are the Arilou worried about "them" finding human-kind? I mean, obviously the Orz have already been made aware of humans, and yet at no point do we return to the starbase to find everybody mysteriously eaten. I think the Arilou and Orz are natives of QuasiSpace, and "they" are at least one more dimension "up" the ladder.