the first kill

here i was about to kill another person and i froze. i kill people all the time now so why did i freeze? it was because this particular person reminded me of my first kill. it was autumn in Maine about six years ago when i someone get mugged. that person was my little sister and the mugger killed her before i could help. i spent the next two years tracking this guy down. when i finally found him he was at home with his wife and three daughters. This made me so mad. How could he have three girls and kill my sister and not have nightmares about his girls getting mugged. i had to kill him. i had to right there and then. I broke down the front door and grabbed a knife that was on the kitchen counter and just kept stabbing him. i must have stabbed him at least twenty times before his wife pulled me away from him. from that point on i decided to fight for good people. know that i look at this person i realize that it is one of that mans daughters! i must have made her think the same way i am now. so what should i do kill her or let her go?