Killer in the school

After a minutes walk you reach the staff room. You are suprised when you discover the door open, it is usually locked. However when you look inside you are nearly sick at what you see. There is blood and guts all over the staff room. You can't hope to imagine what happened here although you have some ideas. Whoever got Kathleen had been in here too. It is almost like the killer is trying to get rid of any possible adult threat. Although obviously you can't tell but you are sure all the staff (well pieces of them) are here. You notice a message written in blood on the wall. It says "no more adults!". You are puzzled by this and begin to wonder whether a student has been doing all these killings. You decide you have seen enough.