exciting and fast, but not completely satisfied

Rating: Null/10 (18 July 2011)

Although I would rate it 8 out of 10 and have seen a very exciting movie I am left with the feeling the ending is not as it should have been.
It happens in most movies that have some form of time travel, even though in this case it was not even "real" time travel, but just a search in someone's memory.
Suddenly the explosion on the train has not taken place, and the future has been altered and what ever happened to the real Sean?
Think I might read Dinosaur Beach (Keith Laumer) one more time. Nevertheless, exciting it was.