Agatha initially agrees to manipulate Billy into doing just that, then has a last-minute change of heart. She kisses Rio/Death and thereby embraces her fate, sacrificing herself so Billy can live. From the start she had a soft spot for the teen, accompanied by references to her long-dead son. The backstory is quite moving and key to Agatha’s unexpected change of heart. Her son’s fate was revealed in the finale. Death came for him when Agatha was in labor but agreed to grant her “time.” How much time? Six or seven years, during which mother and son bonded and wandered from village to village, with Agatha occasionally killing more
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