When will Satan join the false prophet and Antichrist in their doom?
Satan will join the false prophet and the Antichrist in their doom sometime later. The two men go to their doom first, and Satan goes there as well afterward. They operate as an unholy trinity in unison, but their doom is not simultaneous.
Les explains that the false prophet and the Antichrist are two human men who are part of an unholy trinity with Satan. They go to their doom, but Satan will go there as well and join them sometime later. These three work in unison much as the Holy Trinity does. The false prophet fulfills a counterfeit role of the Holy Spirit by causing people to worship the Antichrist, and both he and the Antichrist are under Satan's control and power.