They are impressed by Ian Kognitos, the famous British comedian who stood up, who died while acting. The actor sat in a chair and raised his head, with the audience thinking it was part of the show, as it had reported a blow or a blow a few minutes before.
When they realized that he was "gone" they were overwhelmed. His character was explosive and used to make plaques when he was on stage, so his behavior was not strange at the time.
The other comedians who waited for them to realize they realized that Kognito took it to get up and rushed to the scene to offer her first aid. They called an ambulance while I had artificial respiration. The theater was evacuated.