Śrīmad-Bhāgavatam 10.72.38
Blended reading (Sanskrit + English inline)
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ayaḥ-sparaśaiḥ
—
whose touch was like iron
Compound instrumental. Ayas — iron. Their fists strike like iron. The image foreshadows Bhīma's later fame in mace and wrestling combat at Kurukṣetra.
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muṣṭibhiḥ
—
with the fists
Instrumental plural. Muṣṭi-yuddha — fist-combat — is the third tier after weapons fail. The duel descends from gada to muṣṭi to bāhu-yuddha (grappling), a complete śāstric sequence.
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vajra-paruṣaḥ
—
harsh like thunder
Compound nominative. Paruṣa — harsh, jarring. Thunder is the third sound-figure of the duel (after caṭa-caṭā and dantinoḥ); the verse has now exhausted Sanskrit's loudest similes.
When their clubs were broken they pounded each other with their fists.
When the clubs were destroyed, they beat each other’s limbs (apiṣṭām) with fists like the touch of iron. They then hit each other with the palms of their hands with a harsh sound like thunder in a cloudless sky (nirghāta).
When their clubs were destroyed, they struck each other’s limbs with their iron fists. The sound of striking or injuring with their hands was harsh like thunder in a cloudless sky (nirghāta).
When weapons fail, the wrestler's body becomes the weapon. Iron-hard fists strike like elephants colliding. The Bhāgavatam compresses 27 days of Mahābhārata wrestling into a single śloka of percussive Sanskrit.
My note
Source: vedabase.io