sarpa-satre -- in the snake sacrifice; samiddha -- blazing; agnau -- in the fire; dahyamanan -- being burned; maha-uragan -- the great serpents; drishtva -- seeing; indram -- to Indra; bhaya -- with fear; samvignah -- very disturbed; takshakah -- Takshaka; saranam -- for shelter; yayau -- went.

When Takshaka saw even the most powerful serpents being burned in the blazing fire of that snake sacrifice, he was overwhelmed with fear and approached Lord Indra for shelter.