Śrīla Viśvanātha Cakravartī Ṭhākura explains that the Lord used the plural form in the beginning of this verse — “We are satisfied” — because He was referring to Himself along with Śiva and Umā, who will later be glorified by Mārkaṇḍeya. The Lord then used the singular — “I am the bestower of benedictions” — because ultimately only Lord Nārāyaṇa (Kṛṣṇa) can award the highest perfection of life, eternal Kṛṣṇa consciousness.