Tell me how you understand the short article "By the Butterfly Spring", the last paragraph

The moon was rising, people lit bonfires in the bamboo forest by the Butterfly Spring, and curls of colorful mist drifted up. A group of girls danced on bamboo boards, and people played jade flutes to accompany them. Suddenly, a group of colorful saucers flew out from the colorful mist and flew around the crowd. The beautiful colors on their bodies dazzled the people, and they could not help but all happily dance the "Nei Shang Dance".

The moonlight shone into the bamboo forest, and everything seemed to be covered with a clear veil. Behold, a dozen or so colorful butterflies dancing, for this beautiful moonlit night smeared with a little mysterious color. They disappeared for a while, appeared for a while, constantly changing this, and dance steps, and the rhythm of the bamboo board dance is getting faster and faster. A little A-mei jumped on a stone and blew "By the Butterfly Spring" to the moon. At once, ten million more colorful butterflies lightly floated out of the colorful mist and joyfully joined the dance. The ever-changing and mysterious dance mesmerized everyone.

Gradually, the night got deeper and deeper, the bonfire party was over, people dispersed, and the colorful butterflies disappeared into the turquoise water of the Butterfly Spring.

The little girl played her flute again, and a large group of colorful butterflies flew from the sky into the bamboo mist. At last, the bamboo forest colored mist rose up to the clouds and became one with the moon. `