I don't mind doing it in the comments: at the end, when they make the rules change announcement, Katniss raises her bow and aims at Peeta without thinking about it. It is a huge moment for her as a character because it underlines her own instinct for survival and is the moment when she really realizes how sincere Peeta is. Up to that point, she idnt sure if his sincerity and naievety is an act. In the movie, it doesnt happen.