SB 10.43.18

hataṁ kuvalayāpīḍaṁ
 dṛṣṭvā tāv api durjayau
kaṁso manasy api tadā
 bhṛśam udvivije nṛpa
Synonyms: 
hatam — killed; kuvalayāpīḍam — the elephant Kuvalayāpīḍa; dṛṣṭvā — seeing; tau — the two of Them, Kṛṣṇa and Balarāma; api — and; durjayau — invincible; kaṁsaḥ — King Kaṁsa; manasi — in his mind; api — indeed; tadā — then; bhṛśam — exceedingly; udvivije — became anxious; nṛpa — O King (Parīkṣit).
Translation: 
When Kaṁsa saw that Kuvalayāpīḍa was dead and the two brothers were invincible, he was overwhelmed with anxiety, O King.