The event didn't happen in a vacuum. It wasn't limited to Lord Enforcer, Lord Envoy, and Khan. The Royal Guard had made an announcement every member of the Empire could understand, and that prompted a widespread response.
The surviving Thilku who had disembarked from the Leviathan-class ship were exhausted, to say the least. Their spirit couldn't be messier after the rollercoaster of emotions they had to go through.
The Thilku in the audience were in a similar state, albeit for different reasons. They weren't tired, but they had just received official confirmation that their Emperor was dead.
Nevertheless, all the Thilku on the scene, without a single exception, moved. Even those too tired or injured to walk followed that trend, relying on their spells or companions to fulfill their duty.
