In Weixi County, Diqing Tibetan Autonomous Prefecture, Yunnan Province, there is such a legend circulating among the people.
A long time ago, the gods in the sky wanted to build a Potala Palace for the Bodhisattva, and the Demon King sent little demons to destroy it and poisoned the skilled craftsmen to death.

The Bodhisattva, who was in charge of building the palace, invited an eminent monk proficient in Buddhism to punish the demon king. The eminent monk found handsome and beautiful young men and women, taught them the most beautiful dance, and danced on the lawn in front of the construction site, attracting thousands of people. The people followed and danced, the demon king pretended to be a Tibetan compatriot and entered the dance hall to make monsters and mischiefs. The eminent monk used a plan to fly out a steel knife from his cuff to kill the demon king.
The dance taught by eminent monks was originally designed to trap and kill the Demon King. When dancing, the female dancer held a drum made from the Demon King’s ribs. People called this dance “Rib Dance” and later called it “Reba”. "Dance", and that forehead has been widely circulated among Tibetan folks to this day.