so 'patad bhuvi nirbhinna-
lalāṭo 'sṛk samutsṛjan
muñcann ārta-svaraṁ śailo
yathā vajra-hato 'ruṇaḥ
saḥ - he, Balvala; apatat - fell; bhuvi - to the ground; nirbhinna - cracked open; lalāṭaḥ - his forehead; asṛk - blood; samutsṛjan - gushing; muñcan - releasing; ārta - of agony; svaram - a sound; śailaḥ - a mountain; yathā - like; vajra - by a lightning bolt; hataḥ - struck; aruṇaḥ - reddish.
According to the ācāryas, the demon appeared reddish with blood, like a mountain red with oxide.