It is enough to say that Dingaan, after thanking Retief for recovering the cattle, asked where was Sikonyela, the chief who had stolen them, as he wished to kill him.
When he learned that Sikonyela remained in his own country, he became, or affected to become, angry.

Then he asked where were the sixty horses which he heard we had captured from Sikonyela, as they must be given up to him.
Retief, by way of reply, touched his grey hairs, and inquired whether Dingaan thought that he was a child that he, Dingaan, should demand horses which did not belong to him.

He added that these horses had been restored to the Boers, from whom Sikonyela had stolen them.
When Dingaan had expressed himself satisfied with this answer, Retief opened the question of the treaty.

The king replied however, that the white men had but just arrived, and he wished to see them dance after their own fashion.

As for the business, it might "sit still" till another day.
So in the end the Boers "danced" for his amusement.