Cass and Fiona, now that the King had arrived, were being approached by people. Cass, much like how he had treated the Duke, forced them to introduce themselves to him. He knew their names, but he was an asshole, and was proving a point.
Everyone knew his fucking name, but no one was approaching him. He was going to make them realise that was a poor choice. The nobles who had been to his mansion only a few days before went out of their way to approach him and greet him. They were nervous, shaking creatures, and Cass was happy about the fear that he had struck into their souls.
Did it play into his demon bloodline? Oh absolutely. Did he care?
Fuck no.
Things only got strained for Cass when he ran into him.
His grandfather.