The first thing to do is look for timing clues in the text.
Matthew 16:27 For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works.
28 Verily I say unto you, There be some standing here, which shall not taste of death, till they see the Son of man coming in his kingdom.
Mark 9:1 And he said unto them, Verily I say unto you, That there be some of them that stand here, which shall not taste of death, till they have seen the kingdom of God come with power.
Luke 9:26 For whosoever shall be ashamed of me and of my words, of him shall the Son of man be ashamed, when he shall come in his own glory, and in his Father's, and of the holy angels.
27 But I tell you of a truth, there be some standing here, which shall not taste of death, till they see the kingdom of God.
Timing clue---For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works.
Timing clue---For whosoever shall be ashamed of me and of my words, of him shall the Son of man be ashamed, when he shall come in his own glory, and in his Father's, and of the holy angels.
Obviously, these timing clue events are pertaining to His 2nd coming. But His 2nd coming is yet to happen, and some standing there at the time have already tasted of death since they are presently dead and have been for at least 2000 years. Yet, look what the text actually says, though---there be some of them that stand here, which shall not taste of death, till they have seen the kingdom of God come with power.
When does the kingdom of God come with power? If we look at one of the timing clues---For the Son of man shall come in the glory of his Father with his angels---then compare that with similar Scripture, it seems to be meaning when this timing clue is meaning.
Matthew 24:30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
It says it right in this very verse---they shall see the Son of man coming in the clouds of heaven with power and great glory. It doesn't mention angels, yet we know from other Scriptures angels will be accompanying Him at the time. Scripture such as the following.
Matthew 25:31 When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
Interestingly enough, this is when some standing there at the time will taste of death once they are gathered from all nations, then separated, then end up on the left instead of the right. They taste of death, meaning the 2nd death, because they are cast out of the kingdom rather than welcomed into it instead. You're still probably wondering how they end up at the sheep and goats judgment to begin with if they are already dead by that time? Ever hear of being resurrected?
The fact I'm Premil, some of this does seem to contradict that position if I am correct about any of these things. That's something I still need to try and iron out if possible. If not, maybe it simply proves Premil is not the correct position after all, and that maybe I just need to admit it eventually?