Why does the Arab prince have Firdaus arrested in the novel, Woman at Point Zero?

The Arab prince propositions Firdaus and agrees to pay three thousand pounds. He angers her during sex by repeatedly asking if she feels pleasure. Afterward, Firdaus rips up his money and admits that she murdered a man. She slaps the prince when he does not believe her, and he has her arrested for murder because she is a dangerous and savage woman.