Initial Shock and Disbelief: Katniss is initially stunned and horrified by the act. She doesn't actively seek out the kill, but it happens in the heat of the moment during the Games' chaos. The scene reflects the brutality of the Games and the desperation Katniss feels to survive.
Guilt and Sorrow: Despite not targeting Marvel specifically, Katniss carries the burden of his death. She recognizes him as a fellow tribute, someone who was also forced into the Games. This guilt lingers, adding to the emotional toll of the Games.
Survival Instincts: While feeling remorse, Katniss understands that killing was necessary for survival. The Games are designed to be brutal, and she had to act to protect herself and potentially her sister Prim. This understanding adds to the conflict within her, making her feelings about the act even more complex.
Distancing: As the Games progress, Katniss starts to distance herself emotionally from the act. It's a coping mechanism to survive the psychological trauma and the constant threat of death. This detachment doesn't erase her guilt but helps her function in the harsh environment.
Manipulation: The Capitol uses Katniss's guilt and the death of Marvel to manipulate her image. They portray her as a "Mockingjay," a symbol of rebellion, and use the boy's death to fuel the uprising. This makes the situation even more emotionally challenging for Katniss, as she's being manipulated and forced to represent something she doesn't fully understand.
Overall: Katniss's feelings about killing Marvel are a mix of shock, guilt, sorrow, survival instincts, and manipulation. This complexity reflects the emotional turmoil she endures throughout the Games and the brutality of the Capitol's control. It's a reminder that even in the most desperate circumstances, the act of killing leaves lasting scars.