Agni did not come within the range of Uma's curse. The eater of sacrificial libations was not present there when the curse was imprecated.
स तु नावाप तं शापं नष्टः स हुतभुक् तदा। तस्माद् वो भयहृद् देवाः समुत्पत्स्यति पावकिः॥१३