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"Hush," he said fiercely. "I am a man. Hush." And she was silent, for his voice was command. "Let us sleep a little," he said. "In the first light we will start. You are not afraid to go with me?"
His answer implies that Juana is to obey him as her husband. He isn't asking, he is commanding. Lastly, he seems to be challenging her belief in him as the family's protector.