in the latest archon quest, we are transported into an arena above the clouds with a mountain peak in the backdrop

The Moon breaks through the false sky close enough that it is a short distance from the arena.

Yet after the fight, we are on the moon, a great distance away from the planet where teyvat resides. so like where is the moon? I have seen some theories on where the false sky's border is, but it still doesn't explain how the moon broke through over here and then went all the way back to space and still managed to be in Teyvats atmosphere.

I read one theory that the False Sky is like a pocket dimension, but the borders are meant to keep outsiders out of teyvat, the twins should not be able to enter teyvat by just crash landing on it.

Any theories?
Ok so like where are we fighting