An audience of adults enter a mysterious arena where they are given free entry but are told nothing about the show other then the promise that it will be the best show of their life. They find out too late they are all part of a constant between two large predators to see who can eat the most of the audience.
I may be making a second version of this story someday using the perspective of the announcer and audience more then then the preds them self and some other rather major changes but keeping the same premise.