Dream of child, screaming

I was at a Walmart and was looking at the electronics section where all the movies were so i looked and kept finding movies with the title Slender, Slender 2 , Slender 3 and all of them had criminals with ski-masks on and on the 1st they were black, 2nd they were white , third was blurred for some reason, then all of a sudden the setting changes into my school and it was dusk and unusually cloudy. The clouds were blue and i was with my friend and so we heard screaming in my science teachers 's class room so we entered and we saw someone's shadow and it was a child getting butchered so we stepped into the hallway and saw a blood trail so we followed. It lead towards the courtyard,Suddenly there was screeching and static electricity noised all around me and my vision became like a static TV with no reception and i was strangling my friend that i was slender. Then the dream ended