Bombay Jack staked a claim on land near the path of an NCR railway, he then immediately started mining a path and blowing up storage sheds to deter people from moving into the area. When the NCR went looking for him they found that he had mined a huge area around his hideout. Before being caught he managed to kill at least 10 soldiers by shooting the mines around them.
He had supplied the powder gangers with homemade explosives, and so to keep their source, the gangers broke him out of the prison train. Though he was caught again and presumably sent back to prison, it's not known how he got out the second time.
Two weeks prior to the players arrival, in response to some comments from Hardin, Bombay Jack flipped out and went off on his own, seizing a nearby claim and guarding it with explosives.
Defeat Bombay Jack at the Box, Defeat Bombay Jack in his Canyon - As long as the player leaves him alone, he'll probably leave them alone. However, if they enter his canyon while he's there, he'll snipe them in the hopes of pushing you into one of his traps. The player's best off entering this place while he's dealing with the traitors as they try to crack the Box.
Bombay Jack has a high Perception, Stealth, and a good ranged weapon, making him able to snipe the player.
If the player attacks Jack with a flamer or molotov, he will blow up. If they attack him with a gun, there’s a chance equal to damage x5% that he will blow up 3 cases of dynamite.
Bombay Jack has not appeared nor is he mentioned in any published game. He was to appear only in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is not certain if he will appear in any future Fallout game.