It's just a polite thing to do to applaude at the end of a movie premiere

It started with a scream. Just a sound; there was no face, no body. The screen was still showing a dim-lit corridor, and some guests even thought the voice came from outside the venue. But they soon realized it came from the pillar--or rather, from the projection. 

Oh--I belatedly realized they had managed to capture the sound. 

On the screen, the scene finally shifted; the camera arrived at a chamber at the end of the stone corridor. There, fire blazing from the torch acted as lighting instead of a mana lantern, casting a swaying shadow on the floor and wall that complimented the eerie scream.

Instinctively, I reached for a small bowl of popcorn that Arta secretly brought. 

As the guests were confused and scared at the same time, the camera turned to the side, and two rows of prison cells could be seen. The focus of the camera, however, was on the single cell on the other side of the chamber.