@cctvdude99(View Post) If you travel back in time and kill your grandfather, then you don't exist forward in time to go back and kill him. That is a paradox. alecnotalex was right. The way your looking at it is a common misconception. Going back in time is not a separate loop. What you're going to already happened, and if you changed it, you already changed it, but if changing it prevents you from changing it the next time in the loop... well you see the point.