“Not all of them . . . evidently.”
Point out in the Bible where it says it didn’t take care of all of them.
The Bible says that the world was destroyed, only Noah and his family was saved. What makes you think there were some exceptions?
Is it your habit to put God and His Word in tiny tidy unfitting little boxes?
See posts #197-199 above.
Sounds like you have an assumption that the Nephilium—100% of the fallen angels that fell with satan—were ON THE EARTH IN PHYSICAL FORM AND BOUND TO THE EARTH IN PHYSICAL FORM such that 100% of them drowned in the flood.
SCRIPTURE does NOT say that in any shape, form or degree.
ASSUMPTIONS, inferences and extrapolations are hazardous.