Dreams are just information from the subconscious. You can think that your subconscious showed you a movie and sent some information to your consciousness. But the subconscious uses primitive symbolic language, not logical language. When describing a dream, we should distinguish between what happened in the dream and what was made up after waking up, and the latter is best crossed out.
Things like the Book of Changes are philosophy, but not psychology, let alone psychoanalysis. You can't analyze dreams with this kind of thing.
Personally, I think this dream is a symbol of similar situations you encounter in reality. You are vaguely aware of some dangers (not necessarily, usually not those threats expressed directly through dreams-such as being killed by a train, but similar' situations', such as symbolizing a sudden disaster), but you are not completely sure, but your subconscious mind can't resist. No matter how you suppress these emotions when you are awake, your subconscious mind will shout them out to you when you are dreaming.