Revelation addresses this issue
And the fifth angel sounded, and I saw a star fall from heaven unto the earth: and to him was given the key of the bottomless pit.
2 And he opened the bottomless pit; and there arose a smoke out of the pit, as the smoke of a great furnace; and the sun and the air were darkened by reason of the smoke of the pit.
The fifth angel sounds his trumpet and a star falls from heaven. This star has the key to the bottomless pit. Stars sometimes have a double reference to angelic beings in the scriptures. This star is called him so it is an angel. The angel was given the key to open up the place under the earth where fallen angels are bound (2 Pe 2 1-10). Some think this angel is Satan and others think it is another angel. I think this angel still has the key when he locks Satan in the bottomless pit for a thousand years after the tribulation is over (Rev 20:1-2). Therefore, the angel is from God and is not Satan.
It is too soon for Satan to be cast out of heaven permanently since the Beast he incarnates when he is cast out of heaven comes out of the pit months after the time of this fifth trumpet. The Beast comes out of the pit just prior to the seventh trumpet just before he kills the two prophets who have completed their 1,260-day testimony (Rev 11:7).
Revelation addresses this issue
And the fifth angel sounded, and I saw a star fall from heaven unto the earth: and to him was given the key of the bottomless pit.
2 And he opened the bottomless pit; and there arose a smoke out of the pit, as the smoke of a great furnace; and the sun and the air were darkened by reason of the smoke of the pit.
The fifth angel sounds his trumpet and a star falls from heaven. This star has the key to the bottomless pit. Stars sometimes have a double reference to angelic beings in the scriptures. This star is called him so it is an angel. The angel was given the key to open up the place under the earth where fallen angels are bound (2 Pe 2 1-10). Some think this angel is Satan and others think it is another angel. I think this angel still has the key when he locks Satan in the bottomless pit for a thousand years after the tribulation is over (Rev 20:1-2). Therefore, the angel is from God and is not Satan.
It is too soon for Satan to be cast out of heaven permanently since the Beast he incarnates when he is cast out of heaven comes out of the pit months after the time of this fifth trumpet. The Beast comes out of the pit just prior to the seventh trumpet just before he kills the two prophets who have completed their 1,260-day testimony (Rev 11:7).