Srimad Bhagavatam Canto 06, Chapter 12, Text 26

SB 6.12.26

dorbhyam utkrtta-mulabhyam
 babhau rakta-sravo ’surah
chinna-pakso yatha gotrah
 khad bhrasto vajrina hatah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Vrtrasura, bleeding profusely, his two arms cut off at their roots, looked very beautiful, like a flying mountain whose wings have been cut to pieces by Indra.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
It appears from the statement of this verse that sometimes there are flying mountains and that their wings are cut by the thunderbolt of Indra. Vrtrasura’s huge body resembled such a mountain.
Srimad Bhagavatam Canto 06, Chapter 12, Text 25
Srimad Bhagavatam Canto 06, Chapter 12, Text 27-29