In terms of visuals, the sight of two Flashes battling each other was one of the biggest WTF moments of the episode.
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Many presumed that future Barry would somehow sneak up and render past Barry unconscious. That plan went down the toilet as soon as past Barry spotted his other self, leading to the pair eventually throwing down and having an awesome-looking brawl up and down buildings.
Of course, future Barry would manage to knock out his past self, but it was still all kinds of impressive to see the sight of these two incarnations of the same speedster butting heads in such a stunning way.