Lord Krishna (His Lilas and Teachings) -Swami Sivananda
Deliverance From Vatsasura
Once Krishna and Balarama were playing with other cowherd boys and tending the calves on the bank of the Yamuna. An Asura assumed the form of a calf and got mixed among the herd. He had the evil intention of killing Krishna and Balarama. Krishna discovered the Asura in the form of a calf in the midst of his calves and pointed him out to Balarama. Then He silently approached the demon. He caught him by the hind legs and tail and whirled him round and round his head and struck him against a tree. The Asura died. The cowherd boys praised Sri Krishna and shouted, “Well done, well done.” The Devas showered flowers on Sri Krishna.
Deliverance From Bakasura
One day the cowherd boys went to a tank to drink water. They saw a huge monster or Asura in the form of a Baka ,who was a friend of Kamsa.The Asura suddenly rushe dat Sri Krishna to strike Him with his hard beak. Sri Krishna held the two beaks apart and tore them asunder like a blade of grass. The Asura died. The gods rained flowers on Krishna.