Why don't you ask John this question when you see him? He applied Isaiah 25:8 to the time when eternity is ushered in (Revelation 21:4) when there will literally be no more death ever again at that point. Do you understand that events in prophecy books like Isaiah are not always fulfilled in chronological order? What exactly do you see written after Isaiah 25:8 that you think occurs after the fulfillment of Isaiah 25:8 and that does not occur within the realm of eternity?
1 Corinthians 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
What I suspect some of you are likely doing is this, abusing the following. In a moment, in the twinkling of an eye---as in you are applying in like manner pertaining to events that follow. Yet, not one single event that follows this event does it ever say nor even hints, that these events are fulfilled within mere moments of time, too.
As if it makes sense to go into all these great details in regards to events that follow after 1 Corinthians 15:52, when these events are only involving mere moments of time. To apply a moment, in the twinkling of an eye, to other events that might follow, is to take this entirely out of context since the context of verse 52 has zero to do with waging war on the beast and it's armies, for example, post this moment in time when the saved are changed from mortality to immortality.
Plus, look how Revelation 11 ends, for example.
Revelation 11:19 And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail.
How could this remotely be involving the time of Revelation 20:11-15 at this point? Shouldn't we be looking in Revelation 16 instead, in order to determine why this chapter ends in this manner and where it picks up again where it left off?
Revelation 11:18 And the nations were angry, and thy wrath is come, and the time of the dead, that they should be judged, and that thou shouldest give reward unto thy servants the prophets, and to the saints, and them that fear thy name, small and great; and shouldest destroy them which destroy the earth
Notice what the text says--- And the nations were angry. What we should be asking ourselves, what does this anger lead to at the time? Anger won't do anyone any good during Revelation 20:11-15. Not to mention, the text says His wrath is come. One is to believe that none of the 7 last vials of wrath equal His wrath is come?
and the time of the dead, that they should be judged,
and that thou shouldest give reward unto thy servants the prophets, and to the saints, and them that fear thy name, small and great
What I have underlined above, what does that have to do with the lost? Are any of those I have underlined meaning any of the lost?