sentences:  After the Khalif orders that Sinbad and Omar be executed, his advisor, Jiddah, persuades him to meet with Murad, the ambassador to Tamerlane, a Tartar leader whose forces are threatening to invade Baghdad.Murad boldly informs the Khalif that the Tartars will soon be storming the city and demands that he and his men be entertained in the meantime.Anxious to save Kristina, Sinbad reveals to the Khalif that Simon possesses the formula for an explosive called "Greek fire" and will share it with the Khalif in exchange for Simon's, Kristina's, Omar's and his freedom.