Barry Allen: How are you still here?
Eobard Thawne: Well... I wanna see how this ends.
Barry Allen: Don't screw with me. How did you get your speed back?
Eobard Thawne: I didn't?
Barry Allen: Stop lying! I saw you, five minutes ago. 1,000 miles from here wearing your original face, pretending you didn't remember me. So, who is he? A version of you from your past? Answer me!
Eobard Thawne: I don't know. And I don't care. Don't you get it. You took my speed. There's no other versions of me out there, no other tricks up my sleeve. You took everything from me. So, why don't you just leave me alone?
Barry Allen: When you were nearly erased during Armageddon, it erased your past didn't it? Which means he's from another timeline. Like when I created Flashpoint, there was another Thawne. The only way to fix things was to let him go. When you fought with the Legends, he tried to keep himself from getting erased, but Black Flash caught up to him.
Eobard Thawne: I guess he didn't finish the job. Here's a suggestion: Why don't you go bother him?
Barry Allen: [draws a picture of the B.L.O.C] The other Thawne built this. Does that mean anything to you?
Eobard Thawne: He didn't build that, that's mine. That's my biometric oscillation chamber that I built two centuries from now, when I was a younger man to see if I could become a speedster like you.
Barry Allen: It worked.
Eobard Thawne: But not the way I intended. Has it tapped into the negative speed force?
Barry Allen: That's why Meena's powers are so erratic. They're not artificial, they're negative. I've seen what that kind of force can do.
Eobard Thawne: Who's Meena?
Barry Allen: Dr. Meena Dhawan, she's the one using the B.L.O.C.
Eobard Thawne: Never heard of her. And guess what? Neither has history. So, I guess your new adversary made sure that this Dr. Meena Dhawan never sees the future.
Barry Allen: Because if she keeps using that device, the negative speed force will start to alter her personality. It'll destroy her.
Eobard Thawne: Not if. When. There's one thing you should know about us Thawnes, Allen, no matter when we exist, no matter what our memories are, we only look out for ourselves. So whatever this new guy's endgame, he'll sacrifice every pawn on the board to get what he wants.
Barry Allen: Not if I stop him before he has a chance.