Śrīmad-Bhāgavatam · Text 7.2.9
Who is speaking and story frame
तस्मिन् कूटेऽहिते नष्टे कृत्तमूले वनस्पतौ ।
विटपा इव शुष्यन्ति विष्णुप्राणा दिवौकस: ॥ ९ ॥
tasmin kūṭe ’hite naṣṭe
kṛtta-mūle vanas-patau
viṭapā iva śuṣyanti
viṣṇu-prāṇā divaukasaḥ
When the root of a tree is cut and the tree falls down, its branches and twigs automatically dry up. Similarly, when I have killed this diplomatic Viṣṇu, the demigods, for whom Lord Viṣṇu is the life and soul, will lose the source of their life and wither away.
Read Śrīla Prabhupāda's purport on Vedabase.io