In document B, “Pocahontas, the King's dearest daughter took my head in her arms and laid down her own upon it to save me from death. Then the Emperor said I should live.” He saw, and remembered Pocahontas saving him. The emperor spared his life because of his daughter. She technically saved him twice, her father knew Smith meant something to her because she saved him.
In document B, “Two days later, Powhatan met me and said we were friends. He told me to bring him two guns and a grindstone and he would consider me his son.”