The horror2 thing, by the way, is the sandworm roar from the scifi channel version of Dune and Children of Dune, with some extra effects laid over.
That sequence (whether or not you look behind you) is one of the scariest moments I have ever encountered in any media, and I would really like to know how you came up with those images (especially insane 1 and 7) and what in the world was that thing that screamed in the horror2 sound...