I read somewhere an idea about halloween, that it goes all the way back to the dead who died during the flood. So then it commemorates the great dying of that time. And that many of these dead were Nephilim hybrids who having perished in the great flood lived on as the demons, who being neither fallen angel or man were assigned to be the evil powers of the air, not going to the lake of fire until the great white throne judgement. The angels who sinned at that time, it says God locked them up in HELL to await judgment DAY, so they are in chains and not free to roam about then.
Jude 1:6
And the angels who did not keep their proper domain, but left their own abode, He has reserved in everlasting chains under darkness for the judgment of the great day;
2 Peter 2
4 For if God did not spare the angels who sinned,
but cast them down to hell and delivered them into chains of darkness, to be reserved for judgment;
