15.Fear
For the first time in his life he truly understood what fear was. Zuko had thought he'd learned it at Brossu, but he knew now he hadn't had a clue. He hadn't actually cared if he lived or died at that point. Hell, he still didn't really.
He was scared stiff now though. That they would be caught, that he would fall before he saw this through. That was what it really boiled down to, that was what he really feared. He was afraid that he would fail his people.