The one who mutters out those words is Paul.
I'm sure that was an utterance of intuition.
I wonder if Zenith will be there, or else if the Guardian Protector will be there.
However, strangely there's a feeling of conviction.
Ahead of this magic circle is the final part of the labyrinth.
"What should we do, Paul? We still have some leeway, but returning once first is an option, as well.