Good question.
“Twice are harbored I itself nine”
is actually correct.
Draw on a sheet of paper:
You, as a dot.
the Area around you, as a Circle.
then, draw a lying 8 over it. ( = Infinity sign)
Draw out of the two connected Globes a curled line down to the outside line of the Circle that surrounds yoz,
You’ll see that you’ve drawn 2 times 9, one going away from the other.
In the center is you.
around you the Area of effect.
Maybe this helps you to understand the systematics behind it.
Since it’s Enochian ( Angels Tounge ), it draws the Energy from Above.
The Energy Shield can be placed onto a target,
which will replace the caster as “I”.
That’s the simple explenation.
The Difficult explenation, is that it basically creates a mirror image and draws the Damage which would have happened into that mirror image.
Sincerely,
¥’Berion