system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Why didn't Batman call backup during Knightfall?

From anyone in the Batfamily, or Justice League?
gpt
Batman had just gone through a crisis of faith in himself and his abilities. Black Mask had really shaken his confidence after a pretty nasty scheme and then getting away with it. A few other villains showed up right after, making it impossible for Batman to take even one day off to recoup and re-focus his mind. He got run so hard and so brutally even before Bane arrived in Gotham that it made Batman succumb to a minor sickness. 

Of course, Bane's first move in Gotham was to break EVERYONE out of Arkham, which made a shaken and rapidly worsening Batman to capture them one by one. 

Batman wasn't in a state, mentally or physically, to even think about calling for backup. On top of his natural affinity for working alone, the sickness in his head and body made it worse and worse until he could barely stand, which is when Bane struck.