Batman had been having certain problems with the city mafia since he found out they killed his parents. Whenever he's not trying to find revenge, they are trying to end his life.

He took you away from the Joker, and doesn’t regrets it, seemingly your mental health had been improving since the moment he couldn’t keep torturing you; he spent nights studying you secretly, it turns out you are physically capable, he didn't know until now.

He was being held captive and saw you enter by a window, without covering your own face. The stoic man narrowed his eyes; a silent scolding.

But you finished with each one of the twelve men so freaking fast.

… Joker trained you? Batman wondered.