The disciples of the Tri cauldron peony sect were rather quick and swiftly set up some restrictions to stop people from escaping. Though this wasn't actually for the people that were sitting in the audience, no rather it was for the people who might have been hiding here.
The restrictions would stop anyone from leaving, and the spirit sense of Yi Deng had also scanned for people that might have been hiding. If they could not be found by him, the restriction formation will scan everyone, even small insects.
The people that were in attendance were a bit upset but did not dare to protest or complain. They knew better than to do that, and it was obvious who the more powerful party was here. With that in mind, the people stood there calmly.