Dreamsphere (Return to the Chaos)

The setting is my high school, and there is an event taking place at night for Halloween. The boys have all engaged in a competition while donning Halloween costumes. The costumes however are known to take control of the person wearing them, transforming them into insane wild men, and the competition has become a death match. We roam the school grounds and fight the people in other teams, some of which have guns. I go to a room and see a friend of mine being chased by two figures who I notice to be almost completely taken over by the costumes. I am able to hide from them but when my friend runs towards me, the two see and begin chasing me too. I escape, but soon find that my mask is beginning to disintegrate along with the skin off my face. I look around and see the same thing happening to others.