Comfortable - The Flash Season 2 Episode 21

Not-Joe is comfortable and calm as he talks to Barry. He says in the trailer that Barry isn't going to go back. Things are about to get very interesting.
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Crime Scene - The Flash Season 2 Episode 21

It's not Joe, but he has the same job as the man we know. He also appears to be in the childhood home of one Barry Allen.
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What Is This? - The Flash

Is Barry looking at his own grave? Is he getting a look at what could have happened?
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The Flash Season 2 Episode 21 Quotes

I'm talking to the speed force. Isn't that like saying I'm talking to gravity, or light, or...?

Barry

Iris: Dad, do you really think he's a metahuman?
Joe: Well, he got zapped by the particle accelerator and he was unconscious. It was worth a shot.
Iris: I gave you that mug!