The Detective is being informed of the string of disappearances/murders that have occured recently and is told to investigate (This will also mix with shots of the impending murder)
Late in the day the 3 Teens are playing Football. One of them kicks the football into a nearby forest and begins to argue with another while the 3rd, unknown to the others goes to get the ball.
The third Teen, while looking for the ball is being stalked by the killer, these scenes can overlap with the First Detective scene. The eventual murder will be implicit
The First encounter with the killer
The two Teens discuss finding the missing Teen back in Walters Woods
The Dectective arrives at the crime scene late and talks with the CSI doctor about the victims Autopsy.
The Teens, while exploring the woods, run into the Detective who commands them to leave. Before they do the killer appears and struggles with the Detective, trying to stab him he manages to make a deep cut into the detectives abdomen but they manage to escape when the detective shoots the killer, temporarilly knocking him to the ground, as the group try to leave together the killer begins to get back up they flee.