Factual error: At the start Bruce Wayne runs into a massive dust cloud formed from the falling building. In the scenes that follow he and the other people have very little or no dust on them at all - they should be completely covered and choking on it.
Batman v Superman: Dawn of Justice (2016)
Plot summary
Directed by: Zack Snyder
Starring: Ben Affleck, Jeremy Irons, Diane Lane, Amy Adams, Jesse Eisenberg, Jeffrey Dean Morgan, Henry Cavill, Gal Gadot, Lauren Cohan
While the world still reels from the carnage caused at the end of Man of Steel, an increasingly vengeful Batman starts plotting Superman's downfall. Meanwhile Lex Luthor has his own ideas for how to control these powerful heroes by pitting them against each other, and Wonder Woman comes out of hiding after 100 years with an agenda of her own...
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Question: Who is it that Bruce sees in his dream/vision while waiting for the file to be decrypted? It seems like it might be the Flash, given his time/dimension-travelling powers, but it doesn't look like Ezra Miller and seems to be wearing some sort of armour.
Chosen answer: It is Flash. He is wearing armour because of whatever has transpired in the future. He often wears an armoured suit in dire circumstances in the comics.
Also, if you look at the bottom of the image frame you can just make out the Flash icon on his chest piece.