Eobard Thawne: And here I was starting to think you'd forgotten all about me.
Barry Allen: But I am forgetting. What's happening to me?
Eobard Thawne: I was wondering when you'd notice.
Barry Allen: It's like I'll be thinking of a moment from my past and then it vanishes. I can't get it back. Why?
Eobard Thawne: Flashpoint. It's a side effect. See, I told you before. You don't know what you're doing. This new reality you've created is starting to overwrite the reality that you and I know. So your original life - your friends, your family - pretty soon, all of that will just fade away.
Barry Allen: Why isn't it happening to you?
Eobard Thawne: Not sure. Unless...
Barry Allen: [looking around his cell, Thawne starts laughing] What the hell's so funny?
Eobard Thawne: Your speed! The more you use it, the faster you lose your memories.
Barry Allen: No. No, you're lying. You just want me to let you out of here. That's never gonna happen.
Eobard Thawne: The you I know from the future, he's not this stupid. Pretty soon, you won't even remember that you're the Flash, and when that happens, this world will become permanent. Time is set like concrete, and nothing will be able to change it back to the way it was.
Barry Allen: That's fine by me.
Eobard Thawne: You know what you have to do. You have to take me back to that night and let me finish what I started.
Barry Allen: You go to hell!
Eobard Thawne: You're taking both of us there! Now who's the villain, Flash? Now who's the villain?