Numbers 13:33
New International Version

33 We saw the Nephilim there (the descendants of Anak come from the Nephilim). We seemed like grasshoppers in our own eyes, and we looked the same to them.

1/3rd Angels fell=33%

13 colonies for the new Egypt

Fallen Angels+Etc=Giants(Nephilim or hybrids, they didn't stop with humans though)

Dead giants cannibalized or drowned by the flood=demons

You're welcome.