tam asmanam manyamana
gale grhita utsrastum
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Because of Krsna’s weight, Trnavarta considered Him to be like a great mountain or a hunk of iron. But because Krsna had caught the demon’s neck, the demon was unable to throw Him off. He therefore thought of the child as wonderful, since he could neither bear the child nor cast aside the burden.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Trnavarta intended to take Krsna up in the sky and kill Him, but Krsna enjoyed the pastime of riding on Trnavarta’s body and traveling for a while in the sky. Thus Trnavarta’s attempt to kill Krsna failed, while Krsna, ananda-cinmaya-rasa-vigraha, enjoyed this pastime. Now, since Trnavarta was falling because of Krsna’s heaviness, he wanted to save himself by throwing Krsna off from his neck, but was unable to do so because Krsna held him very tightly. Consequently, this would be the last time for Trnavarta’s yogic power. Now he was going to die by the arrangement of Krsna.