I've been reading "Book of Revelation: The Open Book of Prophecy" by Charles Homer Giblin. You may agree or disagree on his comments, but still entertaining. Something about angels too. I wonder if Revelation 14:18 is about Uriel? I know no another angel who has the power of fire.
14:18 Still another angel, who had charge of the fire, came from the altar and called in a loud voice to him who had the sharp sickle, “Take your sharp sickle and gather the clusters of grapes from the earth’s vine, because its grapes are ripe.”
Does "came from the altar" mean he was sacrificed/slain of some kind? Can be, because starting from Revelation 2:1 angels are referred as present on the Earth. Exciting.