Demigods get a lot of projectiles launched their way: arrows, ballistae, greek fire, hydra venom, the occasional pile of monster poop. You learn to dodge quick if you value your life.

Nico can honestly say he has never dodged a....projectile paper air plane? He picks it up and stares at it incredulously, realizing that it's a page from one of those stupid books (not his, thankfully). He turns and shoots an irritated look at the source. "Seriously? You're throwing paper airplanes?"