Peeta’s heart stops after he hits the force field, and Katniss initially mistakes Finnick’s intervention for an attack. Finnick performs mouth-to-mouth resuscitation and chest compressions, reviving Peeta after agonizing minutes. Katniss is overwhelmed by relief and gratitude, but Finnick’s success also deepens her conflicted feelings because it makes her indebted to a potential future enemy.

Once Peeta recovers enough to move, the group presses on because they have no water and cannot safely remain exposed. Katniss hides the real reason she can detect the force field, claiming her reconstructed ear can hear it, and leads by throwing hard nuts ahead to test the boundary. As they travel, she studies Finnick’s motives, noting that he saved both Mags and Peeta and continues to honor Haymitch’s alliance, even though he remains dangerous.

After climbing a high tree, Katniss confirms that the arena is a carefully engineered dome: a circular jungle around a central wheel, enclosed by a force field above and around them. That discovery means there is no escape route over the ridge, and the lack of visible fresh water becomes a more urgent threat. Forced back toward lower ground, the group makes camp near the force field, using it to roast nuts and a tree-dwelling rodent Katniss kills while searching in vain for water.

At dusk, the fallen tributes are shown in the sky, and Katniss learns that eight victors have died, including Seeder, Cecelia, Woof, and others. A sponsor gift then arrives: a small metal tube none of them can identify at first. Remembering how Haymitch uses gifts as clues, Katniss eventually realizes it is a spile, the kind her father used to tap maple trees.

That insight solves their immediate crisis. Working together, the allies bore a hole in a tree, insert the spile, and discover drinkable water inside the tropical trunks, confirming why the tree rat’s muzzle had been wet. With their thirst relieved, they settle into watches for the night. Then twelve bell-like chimes sound, lightning strikes in the distance, rain falls elsewhere but never reaches them, and Katniss notices an unnaturally advancing, sweet-smelling fog.

Recognizing that the fog is another manufactured arena threat, Katniss wakes the others at once. She is already beginning to blister before they can react, showing that the arena’s dangers now come not just from other tributes but from timed, lethal environmental traps.