tat-prāṇa-randhreṇa vivigna-cetāḥ

evam-in this way; sah-He (Lord Visnu); niscitya-deciding; ripoh-of the enemy; sariram-the body; adhavatah-who was running after Him with great force; nirvivise-entered; asura-indra-O King of the demons (Maharaja Bali); svasa-anila-through the breathing; antarhita-invisible; suksma-dehah-in his finer body; tat-prana-randhrena-through the hole of the nostril; vivigna-cetah-being very anxious.