नृप: king, अंशुमत: Anshuman's, घोरसङ्काशम् aweful, वाक्यम् words, श्रुत्वा having heard, यथाकल्पम् in accordance with rules of Kalpa, the vedanga, यथाविधि in accordance with the scriptures and tradition, यज्ञम् sacrifice ,निवर्तयामास performed.

The king heard (was stunned to hear) the awful words of Anshuman, (yet) he performed the sacrifice in accordance with traditional scriptures and Kalpa, the Vedanga.