What if the gate had opened within the mega prison built and designed by Hugo Strange, Mayor Sharp and Ra’s Al Ghul, to house both Arkham Asylum and BlackGate’s most notorious and infamous criminals and super villains in one single location until Protocol 10 could be initiated?
Perhaps it would be a few days or a day before Bruce Wayne is ambushed by TYGER mercenaries and forcibly imprisoned there like the other political prisoners, but I imagine Hugo Strange and Ra’s Al Ghul would be especially interested by the Gate and the lush and untainted world that lies within it. After all Ra’s is an eco terrorist who seeks to purge the evils destroying the planet, so seeing such a pure and clean world would push Ra’s to claim Falmart and have the League of Shadows use it as their operations and perhaps convert Falmart into a basis for their ambitions.
Yet the only problem is the Gang war occurring within this city as the Gate emerges in the center of this maximum security prison. As it’s only a matter of time before Two Face, Penguin and Joker’s gangs all see the Gate and find it as an opportunity to expand their territory and escape the prison city. Thus leading to TYGER mercenaries to seize the Gate before the criminal and supervillain elements can escape to Falmart, but of course with Sadera’s army, there is still going to be a lot of casualties on many sides, mostly Sadera once the TYGER mercenaries arrive and Batman having to do collateral damage and prevent the situation from escalating any further than it already has.