Batgirl: throws a smoke bomb. While the robbers are confused, takes them out. As the smoke clears, the robbers are on the ground.
Batgirl: counts them and sees there's only three. "Wait a second..." Feels the familiar pressure if a gun in my back. Robber1: "Don't move."
Nightwing: -turns to batgirl- what are you doing fighting with that heartless monster that calls himself a hero