My questions is, What would be a great twist for the ending of my short story, one that will shock everyone in the class?I am going to be writing a...

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?