"It is a little-known fact about covert operations that you will spend a lot of time with people you can’t really trust. They may be traitors and liars. We call them assets or informants. But mostly, in those days, I called him Zach."

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Finally, Peeta turns to Pollux. "Well, then you just became our most valuable asset." Castor laughs and Pollux manages a smile. We're halfway down the first tunnel when I realize what was so remarkable about that exchange. Peeta sounded like his old self, the one who could always think of the right thing to say when nobody else could... I glance back at him as he trudges along under his guards, Gale and Jackson, his eyes fixed on the ground, his shoulders hunched forward. So dispirited. But for a moment, he was really here.

— Suzanne Collins