Vṛtra’s Cosmic Threat, Viṣṇu’s Upāya, and the Conditional Vulnerability
Udyoga-parva 10
सवज्रमथ फेन त॑ क्षिप्रं वृत्रे निसृष्टवान् | प्रविश्य फेनं तं विष्णुरथ वृत्रं व्यनाशयत्,यह सोचकर इन्द्रने तुरंत ही वृत्रासुरपर वज्गसहित फेनका प्रहार किया। उस समय भगवान् विष्णुने उस फेनमें प्रवेश करके वृत्रासुरको नष्ट कर दिया
sa-vajram atha phenaṁ taṁ kṣipraṁ vṛtre nisṛṣṭavān | praviśya phenaṁ taṁ viṣṇur atha vṛtraṁ vyanāśayat |
Pensando así, Indra arrojó con presteza aquella espuma—junto con el vajra, el rayo—contra Vṛtrāsura. En ese instante, el Señor Viṣṇu entró en la espuma, y Vṛtra fue aniquilado.
शल्य उवाच
Righteous action succeeds when it accords with dharma and is supported by higher order: even an unconventional instrument (foam) becomes effective when guided by divine presence and a just aim.
Śalya recounts how Indra, after considering the situation, quickly strikes Vṛtra with foam along with the vajra; Viṣṇu enters that foam, enabling the destruction of Vṛtra.