atyarocata māriṣaḥ

sah-He (Vamanadeva); brahma-varcasena-by His Brahman effulgence; evam-in this way; sabham-the assembly; sambhavitah-having been welcomed by everyone; vatuh-the brahmacari; brahma-rsi-gana-sanjustam-filled with great brahmana sages; ati-arocata-surpassing, appeared beautiful; marisah-the best of the brahmacaris.