In the season finale of the flash Eddie Thawne shoots himself in the heart that earased Eobard Thawne from the past. But, questions is awry is how does the reverse flash exisist if. Eobard Thawne was erased when Eddie died. My theory is when the worm hole became unstable and about to destroy the world. Barry runs to the worm hole to try to stop it well I believe that Barry will reverse the time span and stop Eddie from killing himself.