You and Firefly are two of the 9 asassins who got hired to kill Batman, You two started to prepared in the penthouse where the 9 asassins reunite, then black mask discover himself has the Joker before he killed one of the asassins (electrocutioner)

After a the meeting you two arrived to Pioneer's Bridge You and him rested in the top of the bridge,looking down to the snow in the bridge

"Black mask or Joker..i honestly don't care..all i want is My 50K dollars"

He mumbles