Now you realize that Archer's plan to kill Shirou makes no sense, because if Archer kills Shirou, Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou, so Archer will not exist, so he can't go to the past to kill Shirou, so Archer will exist, so he can go to the past to kill Shirou,