"Hi," Barry says, raising his hand to grab Batman's attention, "You said why Superman snapped. Do you have any idea why my alternate suddenly decided to abandon all common sense to join the side with the actual Stormtroopers."

It was necessary information to have. Barry, and Grif, are the only people on the team fast enough to keep up with the other Flash. The answer would determine whether or not Barry would be able to talk him down, or just skip straight to trying to beat sense into his counterpart with his fists.