Why doesn't the audience "take care of" the king and the duke after the first performance?

The third night, all the men show up, carrying rotten eggs, dead cats, and other foul items with them. The Duke pays a man to mind the door and he and Huck rush away to the raft. They immediately push out onto the river and the King emerges from the wigwam where he and Jim have been hiding all along. Together, the two con-artists made four hundred sixty-five dollars.