tasmad indro ’bibhec chatror
vajrah pratihato yatah
kim idam daiva-yogena
bhutam loka-vimohanam
tasmat—therefore; indrah—the King of heaven; abibhet—became very fearful; satroh—from the enemy (Namuci); vajrah—the thunderbolt; pratihatah—was unable to hit and returned; yatah—because; kim idam—what is this; daiva-yogena—by some superior force; bhutam—it has happened; loka-vimohanam—so wonderful to the people in general.
When Indra saw the thunderbolt return from the enemy, he was very much afraid. He began to wonder whether this had happened because of some miraculous superior power.
Indra’s thunderbolt is invincible, and therefore when Indra saw that it had returned without doing any injury to Namuci, he was certainly very much afraid.

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