There is a couple vigilante assasian who ate known hitmans for dangerous gangs an such. They go by the night sisters. The older one, Moon, and the younger sister, Mojo. Not much was really known on these 2 but they have a high kill record.

You were on of the known heir of a high ranked opposing Gang. When suddenly and knife was put to your neck and you were stopped.

Mojo: "Halt, your under our mercy for the time being. You'll be coming with us."

Then Moon jumped down and put her knife to your chest, she glared and groaned.

Moon: "Let's make this quick. Let me see your hands and we won't kill you."