At one point in his life, Garfield decided to indulge more upon his pyromaniac tendencies and use it to his advantages in the criminal underworld of Gotham
Before the events of Dawn of Justice, Lynns was working with 2 low level thugs in-order to bomb a warehouse full of valuables. While they carry out the plan, they discuss about the Batman, how when he first appeared, he attacked so fast you couldn't even see him. Suddenly, Batman appears and uses a Batarang to destroy the detonator held by Firefly, and proceeds to engage Firefly, who uses his flamethrower to unsuccessfully attack Batman. Batman ultimately subdues him, and leaves the 2 low-level criminals tied up on a sidewalk, for the police to find. While this all happens, CEO Alexander Luthor, Jr ominously watches all this unfold, on a CCTV.
- Flame-Retardant Suit: A full-body flame-retardant suit that Lynns wears when pursuing his criminal interests.
- Flamethrower: A military–grade incendiary device that Lynns utilizes as a weapon when pursuing his criminal interests
- Batman v Superman: Dawn of Justice Prequel (First appearance)