Arkham Batman's roar had no effect, because the scene was genuinely terrifying.
The moment a normal person was surrounded by enemies, they would naturally try to find a way out and escape; if there truly was no opening, they would at least assume a defensive stance. Who would just stand there like an idiot, frozen in place?
Of course, some ordinary people really would be scared stiff, but the people Arkham Batman had found were obviously no ordinary people. Every one of them had razor-sharp instincts. Constantine and Joker Jack in particular were famous for their high intuition and had an exceptionally keen nose for danger.
The instant this scene appeared before them, they turned and ran. Arkham Batman could not stop either of them.
Constantine knew absolutely nothing about Schiller. He only knew that Schiller had some connection to Mephisto and nothing else; Jack knew a little more, at least knowing Schiller had a High Tower, but since the other Schillers had not appeared much in Gotham, he did not know the specifics either. As for the Joker, who truly understood the High Tower's composition, he had already merged with Pride.
Arkham Batman did not know much either, but he had been matched against these unlucky bastards in Battleworld and knew exactly how destructive they were. Pursuer in particular had chased him across more than half a continent in a previous two-player Dungeon, forcing him to flee into the snowy mountains. The two of them had ended up falling into an ice crevasse together, and Pursuer had still had the strength to stab himself. The very thought of it made Arkham Batman furious.
And there was Manipulation. Although he had been quite effective in Jason's reboot treatment, he had also scared Jason badly.
Greed had once mentioned that Schillers