John 18:6-9 (NLT)
6 And as he [Jesus] said, “I am he,” they all fell backward to the ground! 7 Once more he asked them, “Whom are you searching for?”
And again they replied, “Jesus of Nazareth.”
8 “I told you that I am he,” Jesus said. “And since I am the one you want, let these others go.” 9 He did this to fulfill his own statement: “I have not lost a single one of those you gave me.” 
See John 6:39 and 17:12.
John 6:39 (NLT)
39 And this is the will of God, that I should not lose even one of all those he has given me, but that I should raise them to eternal life at the last day.
John 17:12 (NLT)
12 During my time here, I have kept them safe. [a] I guarded them so that not one was lost, except the one headed for destruction, as the Scriptures foretold.
Greek, I have kept in your name those whom you have given me.
TIME OF DAY:
Unspecified I Bible text. Night. A moment after the previous scene.
As with the previous scene, flaming torches provide the warm light that illuminates this picture. Additionally, the moon bathes the scene in a cool, blue-white light.
Jesus is standing in a small group of his disciples. Behind Jesus (from left to right) are John son of Zebedee, James son of Zebedee (John’s brother), Simon/Peter, two unnamed disciples (carrying torches) and Andrew.
Before Jesus are several Roman soldiers and Temple guards, who have fallen backward to the ground (v 6). On the right is the Roman officer and Judas Iscariot.
This scene occurs at the beginning of the Easter week, which is also called “Passion week” or “Holy week”, the time between Palm Sunday through to Easter Sunday (Resurrection Sunday). Included within Passion Week are Maundy Thursday, Good Friday, and Holy Saturday. The term “Passion Week” refers to Jesus’ willingness to suffer on the cross in order to pay the price for the sins of people.
This scene occurs immediately after the previous scene, and shows some of the crowd of Roman soldiers, their officer and the temple guards falling backwards from Jesus. He must have had some presence to cause hardened Roman soldiers to fall to the ground like that! You can tell the temple guards apart from the Roman soldiers in that they have conical metal helmets with a turban at the base.
As with the previous scene, you can see olive trees (Olea europaea) in the background.
You may notice that I have positioned the near full moon behind Jesus’ head, so that it looks like a halo… this design opportunity to symbolise the divine nature of Jesus was just too good to miss!