Bianca narrates the discourse between Prahlada and Indra, and in that Indra says to Prahlada:
Thou art now bound in cords, fallen off from thy former position, brought under the sway of thy foes, and divested of prosperity. Thy present circumstances are such as may well inspire grief. Yet how is it, O Prahlada, that thou dost not indulge in grief?
Question is on the bold text above... Why Prahlada was made prisoner and what caused him to lose everything?