Hunger Games 16-18

What has happened in the book that seems important to the story?

         At the end of chapter 18 Claudius Templesmith (the Hunger Games announcer person) told the six remaining tributes (that includes Katniss) that there was a new rule change. The new rule is that two people from the same district can win. This seems very important to the story because that means that Katniss and Peeta can win. At first I was like "darn! I wish that Katniss would take all her anger out on Peeta (muahahaha) because I don't like him... at all!" But now I think that if they both win Peeta can prove if he is a jerk or not. By pretending if he really does like her or if she like's him....GASP!! I really don't want that to happen. But that can change the story greatly. What if he accidentally shoots Katniss!? That would be horrible! Or if they do win together and then Peeta's just like "I dont like you anymore" at the last moment then bang! He kills her. That would be so messed up!