aviṣahyaḿ manyamānaḥ
kṛṣṇaḿ dānava-puńgavaḥ
vahan drutataraḿ prāgād
avarohaṇataḥ param
avishahyam -- invincible; manyamanah -- considering; krishnam -- Lord Krishna; danava-pungavah -- that foremost demon; vahan -- carrying; druta-taram -- very quickly; pragat -- he went off; avarohanatah param -- beyond the place marked for climbing down.
Pralamba wanted to carry Balarama out of Lord Krishna's sight so that he could cruelly attack Him.