yathaivāśaninā hatāḥ

tena-by that; deva-ganah-the demigods; sarve-all; vrtra-visphotanena-the tumultuous sound of Vrtrasura; vai-indeed; nipetuh-fell; murcchitah-fainted; bhumau-on the ground; yatha-just as if; eva-indeed; asanina-by a thunderbolt; hatah-struck.