Final answer:
In the novel 'Riders of the Purple Sage' by Zane Grey, Agatha dropped a note to Sophie telling her to throw herself into Lassiter's arms to make him abide by 'Thou shalt not kill' in order to stay alive in the Trial by Tale.
Step-by-step explanation:
In the novel 'Riders of the Purple Sage' by Zane Grey, Agatha dropped a note to Sophie telling her to throw herself into Lassiter's arms to make him abide by the commandment 'Thou shalt not kill'. This was a desperate attempt to save Sophie's life in the Trial by Tale. By doing so, Sophie hoped to appeal to Lassiter's sense of mercy and prevent him from carrying out any violent actions.