She dances. Why does she dance?

White Dancer

“Archangels, come to punish the city, lost their way in night clubs, scorched their feathers. The white
dancer runs through their blood, laughing she pauses on tiptoe, with a leg like an unturned bottle.
High up, at an altitude of one thousand meters, to the east stars tell their tales through fir-needled
boughs and at midnight the wild boars’ snouts unearth new springs.”