Actually, God was not outflanked. He told Noah:

Genesis 6:19
19 And of every living thing of all flesh, two of every sort shalt thou bring into the ark, to keep them alive with thee; they shall be male and female.
KJV

flesh: OT:1320
basar (baw-sawr'); from OT:1319; flesh (from its freshness); by extension, body, person; also (by euphem.) the pudenda of a man:
KJV - body, [fat, lean] flesh [-ed], kin, [man-] kind, nakednessself,, skin.

Genesis 7:2
2 Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that are not clean by two, the male and his female.
KJV

God told Noah to take his family which was the only Ademic family that was (perfect in it’s generations) on board the Ark.

He was also to take the clean beasts by sevens (some would be for sacrifice). He was also to take by twos beasts that were unclean (Kenites).

These Kenites were a part of God’s plan and he would have need of them in the future.

Genesis 3:18
18 Thorns also and thistles shall it bring forth to thee; and thou shalt eat the herb of the field;
KJV

These thorns and thistles are symbolic of the Kenites, had God taken them out in Noah's flood this prophecy would have been wrong.

I know that some of these verses are out of context, but their location is given so everyone can read the full context. I did this to save space.