The speaker addresses a "demon," someone who seems drawn to chaos and destruction, and begins by describing a sunrise. The sky turns "blood and fire," which is violent to look at but also beautiful. The speaker suggests this is the kind of wild disorder the demon craves. Two souls colliding and sparking in the dark could be read as a picture of passion, and the poem says life carries them "higher."
Then the tone shifts. The speaker tells the demon to watch as they are cast away, and the single line "So simply" makes the rejection feel effortless and cold. The final lines explain why: the speaker has "other worlds" to live in, and the demon's "hollow sins" can't be forgiven. The mood moves from fiery and seductive to calm and final. The speaker doesn't rage back. They simply walk away, which makes the ending feel quietly powerful.