Katniss would likely be determined to get Peeta back to his normal self. So, instead of just retaliating, she would focus on finding a cure or a way to reverse the hijacking. She might isolate herself with Peeta in a safe place to try and break through to him, using her own memories and emotions to reach the real Peeta hidden inside the hijacked version.
Katniss might be initially shocked. Given her own tough exterior, she may quickly try to restrain Peeta without overreacting. She could be more concerned about what's causing his flashback rather than her own injury at first.
Katniss copes in multiple ways. She has to be strong for herself, Peeta, and the unborn child. Emotionally, she might bottle up some of her feelings at first, but as time goes on, she realizes she needs to let them out. She could start writing in a journal about her experiences, fears, and hopes. Physically, she takes care of herself as best as she can in the difficult situation, eating whatever nutritious food she can find and getting enough rest when possible. Socially, she tries to keep a small circle of people around her who can support her, and she also tries to slowly re - introduce Peeta to those who care about him in a way that won't trigger his hijacked state.
She might get angry. Katniss has a fiery side, and seeing Peeta with another girl could trigger that. She could give Peeta the cold shoulder and refuse to talk to him.
This kiss could potentially be a turning point. It might bring back memories for Peeta or make Katniss more determined to help him recover. It all depends on how the author weaves the story.
In some versions of this fanfiction, Peeta could be a bit worried. Given the dangerous world they live in, he might be concerned about the safety of Katniss during the pregnancy and the future of the child. He could start making arrangements to ensure they have enough resources and protection, while also expressing his love and support for Katniss.
Their friends would have a mix of reactions. Some, like Prim, would be overjoyed and start preparing for the baby right away. She'd knit little clothes and offer medical advice. Others, like Beetee, might use his technical skills to create some useful gadgets for the baby, like a self - warming crib. Johanna might seem indifferent at first, but then show her support in her own tough - love way, by teaching Katniss self - defense techniques even while pregnant.
Perhaps Peeta, while hijacked, is made to target Katniss's friends and family as well. This would put Katniss in a difficult position of having to protect them from Peeta, while also trying to save him. It could lead to some very tense and emotional scenes. Also, Katniss might try to get help from other rebels who have experience with dealing with Capitol - inflicted mental torture to try and reverse what has been done to Peeta.
Peeta and Katniss' love in the fanfiction is also influenced by their different personalities. Peeta is kind - hearted and more open with his emotions, while Katniss is more guarded. His openness gradually breaks down her walls. They learn to understand and accept each other's flaws. For instance, Katniss comes to appreciate Peeta's loyalty and self - sacrifice as they face the challenges together in the story.
They would become more united as they have a new life to protect. Their focus would shift from just each other to their baby, and they would work together even more closely.
Katniss might become more open and less guarded. With Peeta by her side, she could start to trust more easily. Peeta, on the other hand, might become more assertive in protecting Katniss and their new family. His gentle nature could still be there, but he'd have a newfound determination.