When they realize the wolves chasing then are actually genetically engineered humans, the three teenagers decide not to kill them but rather look for alternative ways of defeating them. Katniss and Peeta decide to commit mutual suicide but at stopped by the announcers who declare them winners.
The above is wildly inaccurate. They notice the wolves are mutations of the other tributes so katniss, peeta, and Cato climb the cornucopia. Then katniss kills 2 or 3 but notices she's low on arrows so stops only using them to kill the one she thinks is thresh. Then Cato gets peeta in a headlock and they're in a stalemate because if katniss shoots Cato they both fall to the wolves. Peeta then signals katniss to shoot threw catos hand which she does causing Cato to lose balance and fall. However, due to his body armor the wolves can't kill him easily and just rip up body parts while he's still alive, finally the next morning katniss shoots him in the head to put him out of his misery with one of her last couple arrows. Katniss and peeta go to the lake do the body can be collected (the wolves have left). Then the gamemakers tell them they're revoking the rule about 2 tributes being able to win so try decide to poison themselves so that they have either 2 winners or none. As they put the berries in their mouths the gamemakers come bak on saying stop and allow 2 tributes to win.