so 'patad bhuvi nirbhinna-
lalāṭo 'sṛk samutsṛjan
muñcann ārta-svaraḿ śailo
yathā vajra-hato 'ruṇaḥ
sah -- he, Balvala; apatat -- fell; bhuvi -- to the ground; nirbhinna -- cracked open; lalatah -- his forehead; asrik -- blood; samutsrijan -- gushing; muncan -- releasing; arta -- of agony; svaram -- a sound; sailah -- a mountain; yatha -- like; vajra -- by a lightning bolt; hatah -- struck; arunah -- reddish.
According to the acaryas, the demon appeared reddish with blood, like a mountain red with oxide.