I read the book in middle school and i felt like reading it again but i dont know the name or author of the book. All i know is this man was in the desert for some project of some kind and all of a sudden a lightning storm came upon him and he was sent to this primitive world where he had to fight to survive. I think it ends with him being sent back by the storm just before some enemy native tribes were going to finish him off. Pls help of any kind would be awesome!