Fan Casting Beware the Clown 2

In a department store that sells used costumes, the owner of the store does a inventory and throws away some costumes including a clown costumeThen sometime after some takes the costume and uses the costume to wreck havoc and takes out people who work for the department store The employees are then trapped in the store and the only way to survive is the defeat whoever is the clown only issue is that how can you defeat a clown when you don’t know who the clown is