How did Foulata save Good's life?

Foulata pleads with Good to save her and addresses him as one would address a god. The eclipse that follows shortly after, convincing his captors that she is what he claims.

"Oh, white father from the Stars!" she cried, "throw over me the mantle of thy protection; let me creep into the shadow of thy strength, that I may be saved. Oh, keep me from these cruel men and from the mercies of Gagool!"

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"Look, O king!" I cried; "look, Gagool! Look, chiefs and people and women, and see if the white men from the Stars keep their word, or if they be but empty liars!

"The moon grows black before your eyes; soon there will be darkness—ay, darkness in the hour of the full moon. Ye have asked for a sign; it is given to you. Grow dark, O Moon! withdraw thy light, thou pure and holy One; bring the proud heart of usurping murderers to the dust, and eat up the world with shadows."

A groan of terror burst from the onlookers. Some stood petrified with dread, others threw themselves upon their knees and cried aloud. As for the king, he sat still and turned pale beneath his dusky skin. Only Gagool kept her courage.