Playing with an attorney. He is convinced that the flash gun's adjacent shooting should be read in the broadest sense of adjacency. He believes he can use it to attack two different enemies that are adjacent to Barry but not adjacent to each other since the rules don't specify what the adjacency is in reference to. I believe it means they must be adjacent to each other. Is there an impartial judge in the house?

From a rules and mechanics perspective, it makes more sense for it to apply to adjacent enemies at range, not at Barry's base.