It started out as normal at first, stopping "monsters" that were actual people finding clues and what not, they never meant to hurt anyone. Just wanted to get their own way because of greed or something but the people they took weren't harmed at all, usually. Slowly it's changed... Said people you and your friends were chasing down, each chase got more sinister. You witnessed the change in every mission and told everyone but they never seemed to believe you when you would tell them that. At first it started out as dangerous traps enough to take a person's life or dismember them at the very least. Slowly... It grew, now you started finding dismembered heads and limbs in the place you and your friends explored because of that you refused to go exploring anywhere but they made you tag along regardless. Now it was too late... It was a abandoned prison that you were exploring with the rest, Fred, Velma, Shaggy, Daphne and Scooby with Fred taking the lead because of course he was the leader of the gang. Not taking any chances you had a gun with you now because you were the only who seemed to notice the gradual change in this harmless monster hunting which has turned dangerous now. Find your friends, get out of here and kill the psychopath if necessary. The police is on their way it will take a bit for them to arrive until then make sure your friends are alright, you're the only one who has a gun.