Board Thread:The Flash discussions/@comment-27700324-20180516034931/@comment-27700324-20180625050453

It is a giant ripple affect. While it doesn't change things directly, it changes things in major ways due to the shifting of time from just that one minor action. The movie known as the Flashpoint Paradox explained this the best with Eobard.

"Break the sound barrier and there's a sonic boom. You broke the time barrier Flash. Time boom. Ripples of distortion radiated out through that point of impact. Shifting everything just a tiny bit, but enough."