What would you do?

Late one night you hear a noise coming from your backyard. You go out to investigate, but find nothing. As you are heading back inside you hear a pained sob. It is coming from the shed. You ready yourself as best you can with what is available and open the door. As the light fills the small space you look around. Before you notice a box in the back falls over, and you catch a glimpse of dark hair. At first you think it is an animal, but another sob comes from the direction. You slowly approach and soon discover it is a young girl. Not just any girl. It is the girl who makes your life a living hell at school daily. At first you prepare to get angry...that is until you see the bruises. What would you do if this happened to you? How will you handle this situation? Your enemy is curled up in a ball, bruises all over, in your shed in the middle of the night. Will you help or take your revenge?