The previous section had recounted what happened to the two notorious beasts of Revelation 13:1–18, those two assistants the dragon had conjured up to aid him in his attack on the woman and her offspring (Revelation 12:17). The Rider of the white horse had captured them both and cast them alive into the lake of fire. That leaves the question of what is to become of the dragon himself. That question receives its answer in the present paragraph.
1 Then I saw an angel coming down from heaven, holding in his hand the key to the bottomless pit and a great chain.