Why do you think he has the bullet proof vest on when the Libyans shoot at him? Pretty sure he knows that Marty in the present is the Marty from the past, but he can't let him know until he actually goes back in time, otherwise the time line would be screwed up. I wouldn't be surprised if that was the reason that Emmet Brown had Marty working for him in the first place, a causal loop.
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yeah, but I'm not sure time works like that. How can a timeline be SCREWED, what would actually happen there?
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[quote]How can a timeline be SCREWED, what would actually happen there?[/quote] A time machine is never invented, Marty never goes back, so Marty's dad is still a little b****.