At that time, so very long ago, there were some unfortunate ugly gods called ‘Asuras’. They had taken to living in the second heaven world.
The one who had been Magha the Good in his previous life, was now Sakka, King of the Heaven of 33. He thought, “Why should we, who are the 33, live in our Heaven of 33 with these unfortunate ugly Asuras? Since this is our world, let us live happily by ourselves."
So he invited them to a party and got them drunk on very strong liquor. It seems that, in being reborn, King Sakka had forgotten some of his own teachings as Magha the Good. After getting the Asuras drunk, he got them to go to a lower world, just as big as the Heaven of 33.
When they sobered up and realized they had been tricked into going to a lower heaven world, the Asuras became angry. They rose up and made war against King Sakka. Soon they were victorious, and Sakka was forced to run away.
While retreating in his mighty war chariot, he came to the vast forest where the Garudas have their nests. These are gods who, unfortunately, have no super powers. Instead they are forced to get around by flapping huge heavy wings.
When King Sakka’s chariot drove through their forest, it upset their nests and made the baby Garudas fall down. They cried in fear and agony. Hearing this, Sakka asked his charioteer where these sad cries were coming from. He answered, “These are the shrieks of terror coming from the baby Garudas, whose nests and trees are being destroyed by your powerful war chariot."
Hearing this suffering, King Sakka realized that all lives, including his own, are only temporary. Hearing this suffering, the compassion of the Great Being, which passes from life to life, arose within him and said, “Let the little ones have no more fear. The first training step must not be broken. There can be no exception. I will not destroy even one life for the sake of a heavenly kingdom that must some day end. Instead I will offer my life to the victorious Asuras. Turn back the chariot!"
So the chariot returned in the direction of the Heaven of 33. The Asuras saw King Sakka turn around, and thought he must have reinforcements from other worlds. So they ran, without looking back, down to their lower heaven world.