Question: Doc knows all the timeline details of Marty Jr's movements on the 2015 day. So I assume to get this detailed of information, he had to have watched/followed him on that day. How come you never see the "other" Doc and time machine anywhere from Docs previous 2015 visit?
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Answer: Because the Doc we're following would be careful to stay away from the path of the other Doc.
K.C. Sierra