Rebecca Rubin Film and Media Reporter In another universe, “The Flash,” once touted by its own studio as “one of the greatest superhero movies of all time,” would be towering over the box office with ease in its second weekend of release. But in this universe, audiences are flat-out rejecting the Warner Bros. movie, starring Ezra Miller as the eponymous, timeline-spanning speedster. Rather than taking a victory lap, the comic book adventure is cratering in third place with $15.3 million from 4,265 North American theaters, marking a brutal 73% decline from its unimpressive $55 million debut. That’s a far bigger drop than recent DC adaptations, including “Black Adam” (59%) and “Shazam: Fury of the Gods” (69%), which ended up as huge money losers for the studio.