yena lokā vicetasaḥ

evam-thus; sura-ganan-the demigods; kruddhah-being very angry; bhisayan-terrifying; vapusa-by his body; ripun-his enemies; vyanadat-roared; su-maha-pranah-the most powerful Vrtrasura; yena-by which; lokah-all people; vicetasah-unconscious.