How come anytime Percy goes on a quest he “has a feeling” he won’t be seeing a place/person for an x amount of time?

Love

Spoiler

Nico summoning the dead

with coke and cheeseburgers. I’d come too.

Poseidon telling Percy he’s his favourite son did not sit right with me.

This one was scarier than past ones because of the whole dark labyrinth thing. Honestly, some actually scary parts (or maybe im a wuss sue me)