The falling action would most likely be when they are picked up out of the arena by the hover jet and Katniss goes to take down Haymitch with a needle when he wake up on the hover jet.
The falling action in 'Catching Fire' occurs after Katniss and Peeta are rescued from the arena, leading to their realization of the rebellion sparked by their actions. Significant moments include their rescue by the hovercraft and the subsequent awareness of the dangers they face. This transition prepares the story for the upcoming conflict in the subsequent book.
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