The midnight blood walkers

One day a friend group of five teens were sitting in class when all of a sudden their world became different but for some reason only the five of them got transported into a messed up version of the school so they explored the school in search for help but they find no one and when they give up and go back to the classroom they see a figure outside it looked human but it wasn't it was like a demon from hell, will our group find their way out of this world permanently or will they be stuck in this world every time they blink.