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You know he is trying to help her because he got beat for burning the bread and he knew he would. He hands it to her, he doesn't throw it in the trash and have her get it.
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He wants to show her that she has his support. That if she loses he will help feed Prim.
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He wants her to get sponsored. No one has had a costume like it before, Cinna went out of his way to make it.
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He wouldn't have sent it if he didn't care about her. He believes she can win.
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She showed her the trackerjacker nest above her. She could have not told her and gotten Katniss killed which would help her.
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He warned her to run. He risked his life to save her.
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She gives her leaves that help. She chews them for her. She could have left her there and had her suffer.
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It cost them a lot of money, you wouldn't spend a lot of money for someone you didn't like. They wanted to thank her.
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He wants her to put Peeta to sleep so she can go and get the medicine for him. He has faith they can win.
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He could have let Clove kill Katniss and then attack. He felt he owed Katniss for killing the boy who killed Rue.