a dark, young person came —

once upon a time —

at a point of time —

even once —

 while remaining in panchavati —

 when hiraṇya showed his anger on prahlādhan —

 some time —

 once (during deluge) —

 during krishṇāvathāram —

 with one divine foot, —

 ŏnce, previously —

 another divine foot also —