so ’paviddhah kuru-srestha
namrsyat tad acintyarbhah
simha ksudra-mrgair iva
O best of the Kurus, as Krsna’s son Samba was being unjustly harassed by the Kurus, that darling of the Yadu dynasty did not tolerate their attack, any more than a lion would tolerate an attack by puny animals.
Commenting on the word acintyarbha, Srila Prabhupada writes in Krsna: “Samba, the glorious son of the Yadu dynasty, [was] endowed with inconceivable potencies as the son of Lord Krsna.”