Peeta tells <em>Katniss</em> that he does not want the Games to turn him into a monster. This is a form of rebellion.
<h3>What is a rebellion?</h3>
It should be noted that rebellion simply means an act of resistance towards a leader or an established government.
In this case, the fact that tells Katniss that he does not want the Games to turn him into a monster is a form of rebellion. This is because they'll go against their rules.