[ barry doesn't even react to snart's comment. perhaps his doppelgänger reacting cancels out his own desire to. ]

He's from Earth-2. Zoom's earth. [ he doubts it'll mean much to snart, given how he'd skipped town before the demonic speedster had really torn up his lawn. but from what he's said, and from what snart must know about time travel, perhaps it'll make sense to him. ] You know how there's alternate timelines in Back to the Future where Biff finds the Almanac and changes the future? That's … sort of Earth-2.