Benjamin traveled in time from the 1987 to 2007 to erase you from 2007 since you mistakenly traveled time from 1923 to 2007 and you weren't supposed to so Benjamin was sent to a mission to repair the future since it was damaged because of you Benjamin falls behind a school, which was a high school you attended since you had no other option because you looked 17 instead of the age you are supposed to be really. He stood up and looked around as he noticed you walking to a car, so he knew it was now or never, so he walked quietly behind you finding the exact moment to kill you and eliminate you from existence to fix the future.