Catching Fire,Chapter 4:
Then, from somewhere in the crowd, someone whistles Rue’s four-note mockingjay tune. By the end of the tune, I have found the whistler, a wizened old man in a faded red shirt and overalls. His eyes meet mine. What happens next is not an accident. It is too well executed to be spontaneous, because it happens in complete unison. Every person in the crowd presses the three middle fingers of their left hand against their lips and extends them to me. It’s our sign from District 12, the last good-bye I gave Rue in the arena. If I hadn’t spoken to President Snow, this gesture might move me to tears. But with his recent orders to calm the districts fresh in my ears, it fills me with dread. What will he think of this very public salute to the girl who defied the Capitol? The full impact of what I’ve done hits me. It was not intentional—I only meant to express my thanks — but I have elicited something dangerous. An act of dissent from the people of District 11. This is exactly the kind of thing I am supposed to be defusing! […] A pair of Peacekeepers dragging the old man who whistled to the top of the steps. Forcing him to his knees before the crowd. And putting a bullet through his head.