An account from a shakta agama
शरभस्य प्रभावेन क्षीयमाणोऽभवत् हरिः ततो नृसिंहः क्रोधेन विकृतः प्रलयं ययौ।।१२ गण्डभेरुण्डरूपेण बहुभुजमुखान्वितः॥ नृसिंहः संप्रकुपितः गण्डभेरुण्डरूपधृत्।।१३ आसीदष्टमुखो घोरो त्रिंशभुजबलान्वितः। दंष्ट्राकोट्याः नखैः तीक्ष्णैः शरभं च विधार्य सः।।१४ स शरभं च संक्रुद्धं नखदंष्ट्रैः समाकुलः।छिनत्ति स्म बलात्तूर्णं समरे दारयन् दृढम्॥१५ व्यथितः शरभो भीतः त्राहि त्राहीति चोदितः। ततस्तु शरभो दुःखात् नृसिंहेनार्दितः भृशम्।। १६
— Atharvana rahasyam, uttarbhaga, 4th sarga
"By Śarabha’s power, Hari weakened; then Narasiṃha, in anger, assumed a destructive transformation, moving toward cosmic dissolution. (12) Taking the form of Gaṇḍabheruṇḍa, with many arms and many faces, Narasiṃha, greatly enraged, assumed that terrible form. (13) He became eight-faced and fearsome, endowed with the strength of thirty arms; with countless fangs and sharp claws, he tore into Śarabha. (14) Furious and overwhelming, with claws and fangs he attacked; in battle he swiftly and forcefully rent Śarabha apart. (15) Afflicted and terrified, Śarabha cried out, “Save me! Save me!” Tormented greatly by Narasiṃha, he suffered in deep distress. (16)"
(Note: This Atharvana Rahasya is different from the Atharva Veda’s Atharvana Rahasya and this one is a Śākta Āgamic text, hence its sectarian portrayal of Narasiṃha being weakened by Śarabha and then assuming Gaṇḍabheruṇḍa. The Vedic and Vaiṣṇava Āgamic understanding on the other hand, says that Gaṇḍabheruṇḍa Narasiṃha is Narasiṃha’s own form. Such manifestations are his divine līlā, assumed freely, not under compulsion, as with his countless other forms. Also, both forms are manifestations of the same Lord Vishnu, so claiming one weakened before Sarabha and the other destroyed him, is theologically inconsistent)