Was it the voice of the demiurge?

[Giuseppe]

After six days Jesus took Peter, James and John with him and led them up a high mountain, where they were all alone. There he was transfigured before them. 3 His clothes became dazzling white, whiter than anyone in the world could bleach them. 4 And there appeared before them Elijah and Moses, who were talking with Jesus.

5 Peter said to Jesus, “Rabbi, it is good for us to be here. Let us put up three shelters—one for you, one for Moses and one for Elijah.” 6 (He did not know what to say, they were so frightened.)

7 Then a cloud appeared and covered them, and a voice came from the cloud: “This is my Son, whom I love. Listen to him!”

8 Suddenly, when they looked around, they no longer saw anyone with them except Jesus

Only in this way the two "guardians" Moses and Elijiah could make Jesus go to his final destination (his real mission).

[Giuseppe]

The parallelism is with the titulum crucis:

• The demiurge decides that Jesus is not an alien in the his archontic territory, therefore he gives the pass. But Jesus is really not a creature of the demiurge.

• The Jews believe that Jesus is a mere messianist and they call him "king of Jews" when really Jesus is not the davidic Messiah.

In this way the mission of Jesus is realized: he deceives the demiurge and the his adorers about the his true identity.

[Giuseppe]

Hence it is explained the verse 9:1:

“Truly I tell you, some who are standing here will not taste death before they see that the kingdom of God has come with power.”

The prophecy is realized by the demiurge giving the pass ("this is the my Son. Hear him!" means basically: "this Jesus is a mere creature of the my demiurgical world, therefore he has to be not stopped by the archontic guardians Moses and Elijah"). Now the alien can realize undisturbed the his mission of destruction of the kingdom of the demiurge.

The death of John the Baptist:

And they asked him, “Why do the teachers of the law say that Elijah must come first?”
12 Jesus replied, “To be sure, Elijah does come first, and restores all things. Why then is it written that the Son of Man must suffer much and be rejected? 13 But I tell you, Elijah has come, and they have done to him everything they wished, just as it is written about him.”

....is the same "tying of the strong man":

In fact, no one can enter a strong man’s house without first tying him up. Then he can plunder the strong man’s house.

(Mark 3:27)