And since that fire of God is sent by Jesus from heaven, then the Lord cannot be in the air watching it, as some of your fellow teachers say.
Jesus would be in Jerusalem, not in heaven or in the air.
Rev 20:9 And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down
from God out of heaven, and devoured them.
When John describes "God" doing something, he speaks of God the Father.
While Jesus is Divine and part of the Trinity and thus is God, often biblical writes use other terms for Jesus to distinguish whom they are speaking about.
Rev_1:1 The Revelation of Jesus Christ,
which God gave unto him, to shew unto his servants things which must shortly come to pass; and he sent and signified it by his angel unto his servant John:
Rev_1:2 Who bare record of
the word of God, and of the testimony of Jesus Christ, and of all things that he saw.
Here God is someone else, not Jesus. It is God the Father but shortened down to just God.
Rev 1:5 And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,
Rev 1:6 And hath made us kings and priests
unto God and his Father; to him be glory and dominion for ever and ever. Amen.
Here Jesus makes the saints kings and priests unto God and his (Jesus') Father, again making a clear distinction between the two members of the Trinity.
Rev_2:18 And unto the angel of the church in Thyatira write; These things saith
the Son of God, who hath his eyes like unto a flame of fire, and his feet are like fine brass;
Again Jesus is the Son of God, the Father. When John writes about "God" he is speaking of
God the Father not God the Son or God the Holy Spirit.
Rev_3:12 Him that overcometh will I make a pillar in the temple of
my God, and he shall go no more out: and I will write upon him the name of
my God, and the name of the city of
my God, which is new Jerusalem, which cometh down out of heaven from
my God: and I will write upon him my new name.
Even Jesus makes the same distinction. Here, "God" is the Father of Jesus.
Rev_14:4 These are they which were not defiled with women; for they are virgins. These are they which follow the Lamb whithersoever he goeth. These were redeemed from among men, being the firstfruits unto God and to the Lamb.
Rev_20:6 Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
Rev_21:22 And I saw no temple therein: for
the Lord God Almighty and the Lamb are the temple of it.
Rev_22:1 And he shewed me a pure river of water of life, clear as crystal, proceeding out of
the throne of God and of the Lamb.
Rev_22:3 And there shall be no more curse: but
the throne of God and of the Lamb shall be in it; and his servants shall serve him:
Here are more clear examples of God being someone other than Jesus. This does not mean Jesus is not God ie: part of the Trinity. It is simply a way to speak of each of the two members without confusing them.
Rev 20:9 And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down
from God out of heaven, and devoured them.
This is speaking of God the Father, not God the Son. At this time Jesus is in Jerusalem and has been since the start of the thousand years while God (his Father) remained in heaven and is in heaven to rain down this fire.