There are several directions and plot twists you could take depending upon the details of your story.
For example, perhaps these four students are the best of friends and are completely inseparable. May the only way to defeat these blood thirsty creatures is by becoming blood thirsty creatures themselves. They win the battle, but at what cost? Will they, then, turn on one another?
Or perhaps they defeat the creatures at the camp and then return to their college only to reek havoc on other students there. Who then saves the college?