At this point the 3rd Temple is ready. Some information is given about the devils released from the pit. This 6th trumpet is split in two parts. This one and the rest after the thunders. One third of mankind is a killed by an army of 200 million under command of Russia/Magog (Rev 9:15-
Rev 9:17 And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.
A voice coming from the horns of the golden altar
I heard a voice coming from the horns of the golden altar that is before God.
I don't know why the horns speak, but they seem to provide safety
How can a non-
Bound at Euphrates
Release the four angels who are bound at the great river Euphrates.
Bound has two primary meanings:
a] Tied, imprisoned or similar.
b] Forbidden to do something.
So the angels could be imprisoned near the river but it would be more likely they would be imprisoned in the abyss together with the other angels and locusts. A more likely interpretation is that they were not allowed to cross the river.
Release the four angels
That could simply mean they are given permission to cross the river into the land promised to Abram.
Genesis 15:18 On that day the LORD made a covenant with Abram and said, “To your descendants I give this land, from the river of Egypt to the great river, the Euphrates.
Red, blue and yellow breastplates
Their breastplates were fiery red, dark blue, and yellow as sulfur.
The breastplates of the horses have covenant colors. Red=Blood, Yellow=Salt/Friendship and Blue=Sandal/Inheritance. It's not in the text but I think the horses are black. A combination of the three colors.
Fire, smoke and sulfur coming out of their mouths
A third of mankind was killed by the three plagues of fire, smoke and sulfur that came out of their mouths.
Fire: Refining and testing -
Smoke: Anger -
Tails like snakes
for their tails were like snakes, having heads with which they inflict injury.
Genesis 3:15 and I will put enmity between thee and the woman, and between thy seed and her seed: he shall bruise thy head, and thou shalt bruise his heel.
Isa 9:15 “The elders and prominent men are the head, the prophets who teach lies are the tail.”
The horses likely are in only the area promised to Abram because this Trumpet mentions the angels bound at the border of that area.
“The Mahdi will offer the religion of Islam to the Jews and Christians; if they accept it they will be spared, otherwise they will be killed.” (Ayatollah Ibrahim Amini)