Matsya Purana — Yadu Lineage
ततः समीक्ष्य विष्णुस्तां स्त्रीवधे कृच्छ्रम् आस्थितः अभिध्याय ततश्चक्रम् आपदुद्धरणे तु तत् //
tataḥ samīkṣya viṣṇustāṃ strīvadhe kṛcchram āsthitaḥ abhidhyāya tataścakram āpaduddharaṇe tu tat //
Then, having looked upon her, Viṣṇu found Himself in grave difficulty about the killing of a woman; so, after deliberate reflection, He set in motion that discus for the very purpose of delivering (all) from impending calamity.
This verse is not directly about pralaya; it highlights a crisis-response motif—Viṣṇu intervenes to remove an “āpad” (calamity), a theme that also underlies Purāṇic preservation during cosmic or societal upheavals.
It frames dharma as requiring discernment: even powerful agents must hesitate at adharma such as strī-vadha, and only act—after reflection—when the aim is protection from a larger danger; similarly, rulers and householders should weigh harm carefully and prioritize safeguarding society.
No Vāstu or temple-building rule appears here; the ritual takeaway is theological—Sudarśana (the discus) functions as a protective instrument employed to remove “āpad” (danger) after deliberate contemplation.