In the The Flash Season 1, Episode 16, the narrative explores the "butterfly effect" of time travel after Barry Allen accidentally runs back in time 24 hours while trying to stop a tsunami. Summary of the "New" Timeline
: Eobard Thawne (posing as Harrison Wells) warns Barry that time is a fickle thing. He explains that "saving" one person often results in the universe finding a "replacement" for that tragedy. This is tragically realized when the reporter Mason Bridge—who was investigating Wells—is murdered instead of Cisco. [S1E16] Rogue Time
: The episode concludes with a significant shift in the Flash-Snart dynamic. Barry realizes he cannot simply lock Snart away without risking his secret identity being exposed. He negotiates a "gentleman’s agreement": Snart can continue his heists as long as he doesn't kill anyone. In the The Flash Season 1, Episode 16,
For more details on the episode's production and cast, you can check the "Rogue Time" entry on IMDb . "The Flash" Rogue Time (TV Episode 2015) - IMDb This is tragically realized when the reporter Mason