Beneath the surface of the poisoned pool, Krishna encountered Kaliya in his full terrifying majesty. The serpent king, enraged at the intrusion into his domain, attacked Krishna with tremendous fury. He coiled his massive body around Krishna's limbs, squeezed with all his enormous strength, and struck at the child with his fangs, injecting streams of venom. The Bhagavatam describes Kaliya wrapping Krishna so tightly in his coils that the child appeared completely immobilized, his body disappearing beneath the serpent's massive form.
When the villagers on the bank saw signs of this struggle — the water foaming, the ground shaking — and when they noticed Krishna appearing to be overcome by the serpent's grip, their despair reached its peak. Nanda Maharaj nearly fainted, Yashoda wailed inconsolably, and several of the cowherd men prepared to dive into the pool themselves, preferring death to the loss of their beloved Krishna.
But at this moment, seeing the distress of his devotees, Krishna expanded his body. The Bhagavatam states that he grew so large within Kaliya's coils that the serpent was forced to release him. Then, free from Kaliya's grip, Krishna began to play — not fight, but play — with the serpent. He seized Kaliya's hoods, climbed upon them, and began to dance.
This is the iconic image of the Kaliya Daman — Krishna Nartana, the dance on the serpent's hoods. The small child, dark-skinned and beautiful, standing atop the massive multi-headed serpent, one foot raised in the classical dance posture, his anklets jingling, his flute tucked into his waistband, his face radiant with a smile of absolute confidence.
The Bhagavatam describes this dance in extraordinary detail. Krishna stamped his lotus feet upon each of Kaliya's hoods, and wherever a hood rose defiantly, Krishna's foot pressed it down. The rhythm of his dance was the rhythm of cosmic order reasserting itself over chaos. With each stamp of his foot, venom and blood poured from Kaliya's mouths. The serpent's strength failed him progressively — his hoods drooped, his body weakened, and his resistance crumbled beneath the feet of the child who was also the Lord of all creation.
The villagers on the bank, seeing Krishna emerge from the water and dance victoriously upon Kaliya's hoods, experienced a dramatic reversal of emotion — from the depths of despair to an explosion of ecstatic relief and celebration. The musicians among them began to play, the women began to sing, and the entire community witnessed the extraordinary spectacle of their little boy subduing the monster that had terrorized their world. Understanding why Krishna's dark-blue complexion is associated with the infinite and the unfathomable adds another layer of meaning to this image — the dark child dancing upon the dark serpent in the dark waters, light emerging from darkness itself.