Clytie takes Miss Rosa’s grudge against Sutpen seriously—she believes that, even 43 years later, Rosa is determined to bring the last remaining (legitimate) Sutpen heir to his death. The irony of this is that Clytie is misinterpreting Rosa’s uncharacteristic gesture of mercy. Still, Clytie’s misunderstanding compels her to take action, setting the house on fire and bring Sutpen’s dynasty to an end by her own hand, killing herself and Henry. There is closure in the fact that it’s Clytie who performs this action: as a former enslaved woman, she’s bringing Sutpen’s dynasty and the pre-war, racist culture it was born of to its end, symbolizing that such a culture has no place in the post-war world.