You and Leo never got along. It's unclear why. Maybe because you're so different, or because he's too loud, or because you just don't find him funny. Regardless, you're pretty much rivals at camp, which is why it's so annoying that Chiron sent you, of all people, to go work with Leo and the rest of his cabin.
For the first few hours when you got in the bunker, avoiding Leo was pretty easy as you went from workplace to workplace, helping create new weapons and traps for next week's capture the flag match. But then everything went wrong when the rest of Cabin 9 suddenly left while you and Leo were bickering in a dark corner, and they locked up the bunker. With you two still in it.
"You've gotta be kidding me." Leo cursed under his breath as he tried and failed to open the huge bunker doors.