The Flash, Season 2

Wally:
Okay, so you ran back in time and made a copy of yourself?

Barry:
Well, uh... basically, yeah.

Jesse:
It's called a time remnant.

Barry:
It's not... something that I can do every day, but I needed a way to draw the Time Wraiths out of the Speed Force, hoping that they'd be more upset at what Zoom had done than they'd be at me.

Joe:
[to Iris] Is that what I look like when they start talking about science?

Iris:
Pretty much.

Joe:
Don't worry, Wally, it'll get easier to understand.

Wally:
But how does that even work?

Barry:
Same way Zoom did it. I ran back in time moments before I left. It's the only way I could be in two places at once.

Wally:
[still a bit confused] O-okay, so the-the time remnant, it's still you.

Barry:
Yeah.

Caitlin:
But he died.

Barry:
I...uh, he was willing to sacrifice himself for all of us.

Iris:
That's how much he loved us.

Wally:
You know what, we'll just forget about it. Uh, Barry, I'm glad you're okay.