A very interesting dream! I cannot actually give you any rational explanations to make your mind feel better, but will direct your attention to a few things. What kind of feeling did you generally experience in those later parts of the dream? Sometimes our mind lacks all of the facts to make sense of such dreams. What really would suggest is to file and flag this dream with some special tag. Over time you might get more such experiences and they may begin to make sense to yourself. It's like gathering little pieces of a puzzle, but it takes a long time.

By the way I used to get sucked into vortexes in lds and non-lds during my teens a lot, but haven't had too many such occurrences recently. If you get lucid a lot and have a good prospective memory, I would also suggest getting in touch with some of your DCs and insisting on getting an explanation for all this. Keep asking until you get a really good answer you can remember. The best explanations often come from within. Good luck!