Fallout

"Fallout" is the fourteenth episode of the first season of The Flash, and the fourteenth episode overall. It aired on February 17, 2015.

Synopsis
After the nuclear explosion separates Ronnie Raymond and Dr. Stein, Barry and the team believe both men are safe. Caitlin is thrilled to have her fiancé back and prepares to resume their life together while Dr. Stein returns to his wife. However, when General Eiling targets Firestorm, Ronnie and Dr. Stein must decide if they are safer together or apart. Meanwhile, Mason Bridge tells Iris West that there is something secretive going on at S.T.A.R. Labs and Dr. Stein gives Barry some important information about time travel.

Trivia

 * The two consequences that happen as a result of time travel mentioned in this episode in layman's terms in this episode means you either set history in place with time travel (Predestination Paradox) or you actually alter history. Using the Terminator reference, sending Kyle Reese and The Terminator back in time to protect and kill Sarah Conner respectively actually set history in place for John Conner and Skynet to be born, not altering history, which is a predestination paradox. The Back to the Future reference means time travelling actually alters history.