Joss Whedon took over on Justice League from Zack Snyder, but the studio didn't give him complete control over the movie, including one scene in particular. That scene was in the film's opening minutes. Justice League opens with Batman chasing down a burglar in Gotham, tracking him down to a rooftop. Their encounter ends a bit abruptly because the studio made some changes to the scene. The scene with Batman was originally conceived as a comedic scene.