I think he was selling you short.
Nux and his wives continued to explore the Vampire market, there they realized that although from the Tower, the only buildings that were visible were the large mansions all over the place, however, this did not mean those were the only buildings there were.
Especially in the Market, there were small stalls all over the place, selling different things, mostly toys for the children.
It was a lively environment that Nux and his wives enjoyed after a long time.
However, they also attracted attention.
They were the only non-vampire race in this place, after all, and what's more? They were humans.
Cassius understood that, therefore, he stopped playing his silly games and got serious as well.
"I am sure you enjoyed your looking around the area, now, shall we get to the serious part?"
"Oh? You finally appeared? Where did you go? I didn't even see you leave?"
Nux questioned with a curious look on his face.