Sacrifice Quotes in The Hunger Games

How we cite our quotes: Citations follow this format: (Chapter.Paragraph)

Quote #7

I spread out my fingers, and the dark berries glisten in the sun. I give Peeta's hand one last squeeze as a signal, as a good-bye, and we begin counting. "One." Maybe I'm wrong. "Two." Maybe they don't care if we both die. "Three!" It's too late to change my mind. I lift my hand to m mouth, taking one last look at the world. The berries have just passed my lips when the trumpets begin to blare. (25.93)

At the end of the Games, Katniss and Peeta are ready to sacrifice themselves rather than give in to the Capitol's demands that they kill each other. Why is their act so powerful?