Batman finds the Chinatown fire station ablaze with the fire sprinklers disabled. He powers them, and gets a nasty surprise: Firefly. The pyromaniac declares that Scarecrow left him Gotham to burn, while he plans on getting revenge for being beaten 10 years ago. Batman chases him around Bleake Island, managing to wait Firefly out and pummel him. Firefly takes off to continue burning things.
The Otisburg fire station comes under attack then. Rinse and repeat.
The Drecher fire station comes under attack. Firefly starts a chase, to which loses against the batmobile. Batman commandeers Firefly's jetpack, taking them to GCPD and pulls out the main circuit. Lynns is then left in jail with his ex-partner.