User blog comment:Skitzo1/A Natsu - Zeref theory/@comment-86.135.218.163-20150219101100

May I introduce you to the many worlds theory, an interpretation of quantum mechanics that allows the existence of infinite universes where another 'you' exists but some point in the past they would have made a different decision to you. This could be the idea to travel back in time or not to or ssimply the decision to buy an ice cream or not. There will be one universe where you bought the ice cream. In the same manner it is perfectly logical to believe that by Lucy coming back in time, (also travelling through a universe) that a whole new timeline is created with Lucy's plan having succeeded.