What’s more, we can also guess that this scene will be fairly early in the movie, as The Flash is listed prior to other members of the Squad itself, like Killer Croc, Diablo or Rick Flag.
Not only is Ezra Miller listed in the film’s credits as The Flash, but the cast is listed “in order of appearance” and The Flash is listed immediately after Boomerang.
After we see Boomerang get nabbed, we’ll move on to scenes where we see Killer Croc and Diablo get grabbed.
Boomerang, who is traditionally a nemesis of The Flash, was apparently caught by him.