Revelation 16:13 And I saw three unclean spirits like frogs come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet. 14 For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.
If demons can go directly to kings, and control their minds, then it is a no-brainer that they could also go to Nicholas Cruz, who delivered carnage to Marjorie Stoneman High school. It is worthy of note, that in verse 14 of Revelation 16, the minds of those kings are being directed and prepared for battle.
[Early Writings pp 274] An innumerable host of evil angels are spreading over the whole land and crowding the churches. [Testimonies 8, pp 49] I was shown that a terrible condition of things exists in our world. The angel of mercy is folding her wings, ready to depart. Already the Lord's restraining power is being withdrawn from the earth.
[Review and Herald January 30, 1900 para. 6] The world is not improving. Evil men and seducers shall wax worse and worse deceiving and being deceived. By rejecting the Son of God …… and choosing a murderer in his stead, the Jews showed what human nature can and will do when the restraining power of the Spirit of God is removed, and men are under the control of the apostate. Those who choose Satan as their ruler will reveal the spirit of their chosen master.
Revelation 12:12 Therefore rejoice, ye heavens, and ye that dwell in them. Woe to the inhabitants of the earth and of the sea! for the devil is come down unto you, having great wrath because he knows that he hath but a short time. 17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
May The Lord add His blessing to the study of His word. God bless!