It seemed weird calling a teenager 'sir' but I'd learned to be careful with immortals. They tended to get offended easily. Then, they blew stuff up.
Rick RiordanAmos stopped before the entrance, which was the size of a garage door—a dark heavy square of timber with no visible handle or lock. “Carter after you.” “Um, how do I—” “How do you think?” Great another mystery. I was about to suggest we ram Amos’s head against it and see if that worked.
Rick RiordanImages flashed through his mind. He saw Nico and his sister on a snowy mountain cliff in Maine, Percy Jackson protecting them from the manticore. Percy's sword gleamed in the dark. He'd been the first demigod Nico had ever seen in action. Later at Camp Half-Blood, Percy took Nico by the arm, promising to keep his sister Bianca safe. Nico believed him. Nico looked into his sea-green eyes and though, How can he possibly fail? This is a real hero.
Rick Riordan