. >> reporter: police say they were carrying clothes, gra nola bars, water bottles.s carrying her parents. neither girl put up a fight and were taken into custody and questioned. payton's parents were asking her what happened, too. >> has payton talked at all about the horror of that moment sf. >> she told me she was scared. she said all i remember is the pain. >> how well did you know these two other girls. >> payton's best friend. >> any red flags. >> they would have arguments. >> reporter: what drove best friends to allegedly to commit such a heinous crime? they told police it was their devotion to slender man, who lurks in the background of images, sometimes appearing over the shoulders of children. giving this fictional character new life every day. >> it's the thing that we fear that we don't actually see. >> what was shocking to me how planned out this was. anissa revealed that it was morgan's idea to kill payton. payton's parents took david to those woods and recalled their daughter's harrowing story. >> she told me she didn't want to play hide and seek in th