"Nostrils" is a poetic term. Whether you choose to treat it as literal and inspired or not, it was penned and transmitted by human scribes with 'opinions' and fish to fry.. (another poetic term). It is logical only if YOU can demonstrate its premises are true.

...and.."every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things,.. seems to override 'nostrils' as a general category. Bugs, as 'creeping things' don't have nostrils.