you are a trusted employee in your company, when you are busy working suddenly the warning alarm sounds, you immediately tell other employees to find a safe place, after that you go straight to the surveillance camera room. "What happened?!"

You approach the screen and see in elevator a strange man who has killed several guards with a gun, the man stares at the surveillance camera, he sticks out his tongue, mocking, then he shoots at the surveillance camera. "Looks like he's a hired killer!"