Oh , he ' s robbing a pharmacy . We ' re going to be alright . <| sep |> CSN California does this every game , I thought it was the norm as well . <| sep |> I think Jay explained it best when he brought up the tea cup analogy . If time is not cemented , then you can change it as many times as you want , like clay . But if it is cemented , then if you go back again to the same moment , you ' re going to cause cracks that you didn ' t even think could happen . Which is why in the previous Flash episodes with time travel , Barry going a few moments to even a few months , changing as little as he could , had little impact . Compare that with Flashpoint and all the major events the Legends have to fix , then the timeline will have to mend itself unnaturally , leaving scars in the form of unforeseen consequences .