In "Catching Fire" by Suzanne Collins,  Katniss is changed by the games. When she pulled out the nightlock berries, because she didn't want to have to kill Peeta, one small act of defiance a spark that could catch and turn into a full scale rebellion. Because of this act of defiance other districts had small uprisings, Katniss is forced to convince President Snow and all of Panem that she was madly In love with Peeta, and she couldn't bare to not live with Peeta. Before she would never talk to Haymitch, she hated him. For example, On page 13 she went In to Haymitch's house, when she was delivering him more liquor her face wrinkled up In disgust, she didn't want to go anywhere near him. But now she went to him first, before talking to her closer friends, like Gale, or Peeta, or Cinna, who she trusts. She told Haymitch about her talk with President Snow. This shows that Katniss is being changed by the games.        

       


NOTE: The act of defiance where Katniss almost killed herself with the berries occurred In book 1 of the Hunger Games series, but It had a huge affect on this part of the second book, Catching Fire.
P.S: This was posted at 4:30 not 2:30. :)