The rest were killed by the sword that came out of the mouth of the rider on the horse, and all the birds gorged themselves on their flesh.
In context
19Then I saw the beast, and the kings of the earth, and their armies, gathered together to wage war against the rider on the horse and against his army. 20But the beast was captured, and with it the false prophet who had performed the signs on its behalf, by which he deceived those who had received the mark of the beast and worshiped its image. Both of them were thrown alive into the lake of fire, burning with sulfur. 21The rest were killed by the sword that came out of the mouth of the rider on the horse, and all the birds gorged themselves on their flesh.