SB 6.11.7
tena deva-ganah sarve
vrtra-visphotanena vai
nipetur murcchita bhumau
yathaivasanina hatah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When all the demigods heard Vrtrasura’s tumultuous roar, which resembled that of a lion, they fainted and fell to the ground as if struck by thunderbolts.