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Old 11-07-2010, 02:44 PM
Martin Hyde is offline
Join Date: Mar 2004
Posts: 14,229
Also, I think it's may be the case that Biff witnessed a departure of the time machine in 1985 in the original timeline. So old Biff in 2015 had probably spent the last 30 years wondering if he really saw a time machine back in 1985. When he sees Doc Brown and Marty show up in 2015, he knows instantly that the time machine wasn't just some hallucination and that he could use it to his advantage.