They do have a tendency of doing that, the Fates. You get used to it after a while, sort of.

[As they talk, Zagreus leads them through the winding passages of the Colosseum; soon, they're drawing near to the exit on the other side, and the green-hued daylight waiting beyond the doors.

But at the mention of Persephone, he grows a touch more solemn.]

...Tell her I'm coming back. I won't stop until I make it back to her.