Vrtrasura shook even the mountains and began crushing the surface of the earth with his legs, as if he were the Himalayas walking about. He came before Indra and swallowed him and Airavata, his carrier, just as a big python might swallow an elephant

Expressions researched:
"Vrtrasura shook even the mountains and began crushing the surface of the earth with his legs, as if he were the Himalayas walking about. He came before Indra and swallowed him and Airavata, his carrier, just as a big python might swallow an elephant"

SB Canto 6

Assuming a gigantic body, the great demon Vṛtrāsura shook even the mountains and began crushing the surface of the earth with his legs, as if he were the Himalayas walking about. He came before Indra and swallowed him and Airāvata, his carrier, just as a big python might swallow an elephant.

SB 6.12.27-29, Translation:

Vṛtrāsura was very powerful in physical strength and influence. He placed his lower jaw on the ground and his upper jaw in the sky. His mouth became very deep, like the sky itself, and his tongue resembled a large serpent. With his fearful, deathlike teeth, he seemed to be trying to devour the entire universe. Thus assuming a gigantic body, the great demon Vṛtrāsura shook even the mountains and began crushing the surface of the earth with his legs, as if he were the Himalayas walking about. He came before Indra and swallowed him and Airāvata, his carrier, just as a big python might swallow an elephant.