Final answer:
Doug pays attention to Nargus when he realizes the truth in her words, reflected in her sincere gaze, which aligns with his own beliefs.
Step-by-step explanation:
Doug initially pays attention to what Nargus says to him because he realized that what she was saying was true. The depth of truth in her words sparked a recognition within him, aligning with his own convictions. This moment marks a profound point of connection between Doug and Nargus, enhanced by her clear, steadfast gaze that communicated honesty and integrity. This realization goes beyond surface-level observations and taps into a deeper, more emotional understanding and truthful connection.