These wicked spirit persons are still here, only now they have to work through humans. Acts tells us about a legion of these angels in a man and was happy to make him suffer. But he had super strength the bible says they could not chain him up or keep him from hurting himself. They are really cruel.
(Genesis 6:1-4) 6 Now when men started to grow in number on the surface of the ground and daughters were born to them, 2 the sons of the true God began to notice that the daughters of men were beautiful. So they began taking as wives all whom they chose. 3 Then Jehovah said: “My spirit will not tolerate man indefinitely, because he is only flesh. Accordingly, his days will amount to 120 years.” 4 The Nephʹi·lim were on the earth in those days and afterward. During that time the sons of the true God continued to have relations with the daughters of men, and these bore sons to them. They were the mighty ones of old times, the men of fame.