Revelation 14:8 And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.
Another angel comes saying Babylon has fallen ,but this is not talking about the city but about the world government because it controlled everything and it just begins to to destroyed at the middle of tribulation. This in some way is another warning at the midpoint that it is time to make a decision who you are going to follow Satan or God.