vaidyuta iva vahnayah
siddha-amrta-rasa-sprstah—the demons, thus being touched by the powerful mystic nectarean liquid; vajra-sarah—their bodies becoming invincible to thunderbolts; maha-ojasah—being extremely strong; uttasthuh—again got up; megha-dalanah—that which goes through the clouds; vaidyutah—lightning (which penetrates the clouds); iva—like; vahnayah—fiery.
When the dead bodies of the demons came in touch with the nectar, their bodies became invincible to thunderbolts. Endowed with great strength, they got up like lightning penetrating clouds.
Link to this page: https://prabhupadabooks.com/sb/7/10/60