Everyone present in the hall was already shocked by the discovery of assassins and the framing plot against the Second Prince.
But when the assassin spoke the name of Noble Sir Karlos, the shock in the room jumped to a completely new level. Sir Karlos. That name meant something big. He wasn't just any noble.
He was a member of the King's high council, a group of very important people who advised the King on serious matters of the kingdom, like laws, important decisions, and dealing with other kingdoms. He was supposed to be a man the King trusted deeply.
Hearing his name connected to assassins who broke into the palace to kill a prince and frame another prince was like being hit by a cold wave. Jaws dropped.