On the morning of the 75th Hunger Games, Katniss was once again injected with a tracker by a doctor before being transported to the arena. On the third and final day of the Games, Johanna Mason hit Katniss over the head with a heavy coil of wire, then pinned her down and cut out the girl's tracker.
Plutarch tells her when he showed her his watch, he was tipping her off about the arena and trying to gain her trust. Johanna wasn't attacking her but was instead cutting the tracker out of her arm and leading the Careers away from her.
At this point, Johanna knocked Katniss over the head with the heavy metal cylinder, then cut the tracker out of Katniss's arm so the Capitol would be unable to find her. Johanna also smeared blood across Katniss's face to make Enobaria and Brutus believe she was already dying. Johanna then led the Careers away.
Johanna and Katniss take the first watch that night. Johanna tells her that Mags was Finnick's mentor and half of his family. She also tells her that she was with Wiress and Beetee because of Katniss. According to Johanna, Haymitch said if she wanted to ally with Katniss, she'd have to have Wiress and Beetee with her.
Catching Fire - Johanna Cuts Katniss's Tracker Scene
Why was Joanna's head shaved?
Johanna remains in the Capitol for quite a while, and she and Peeta are tortured for information concerning District 13 and the mockingjay rebellion. While in the Capitol, Johanna's entire head is shaved, making her bald.
The female Morphling, however, appears almost coincidentally, and Peeta even mentions that they don't know her real name. Given that she is willing to make the ultimate sacrifice to protect Peeta, it's safe to assume that the Morphling was committed to the rebel cause.
Unable to find Peeta and hearing a cannon, Katniss nearly attacks Finnick, suspecting his betrayal, but he reminds her to "remember who the real enemy is."
In the case of Johanna, they each hated each other because that was what the Capitol had taught them to do. They were from competing Districts, and the idea of the Games was to keep the lesser citizens of Panem distrustful of one another and unwilling to form alliances (or raise arms in war).
Her third kill occurs at the end of the Games. First, she shoots Cato in the hand so he will release Peeta. Cato falls off the Cornucopia and is attacked by the mutts. Once Katniss realizes that the dogs intend to draw out Cato's death, she uses her final arrow to kill Cato in an act of mercy.
In the 74th Hunger Games, Clove was the only Career tribute who came close to killing Katniss twice — at the Bloodbath and at the Feast, and certainly seemed to have a deep hatred for her, perhaps because Katniss received a higher score than her.
Johanna won the 71st Hunger Games by pretending to be weak and that made all the other tributes leave her for last. Then she unleashed her full potential and violently killed all the remaining tributes. Johanna, being the only remaining District 7 female victor, was Reaped for the 75th Hunger Games.
Katniss said goodbye to a teary Effie Trinket just before entering the arena for the Quarter Quell in the Catching Fire book, and didn't see her again until the preparations for President Snow's execution in Mockingjay.
Later, the two learn President Snow considered their actions to be an act of rebellion against the Capitol. After their last interview, in which the two continue to affect their romantic feelings for one another, Peeta comes to the realization Katniss has staged her love for him all along.
Even though the two were now allies, they still didn't trust each other. During the escape from the arena at the end of these Hunger Games, Johanna 'attacked' Katniss for the purpose of removing a tracking device from her arm, then lead Brutus and Enobaria, the District 2 tributes, away from Katniss.
Chia Mags kisses Finnick on the mouth to briefly let him know that this is the last time she will see him. It's her way of saying "Goodbye" but in a more affectionate way.
Snow laughs after Katniss killed Coin because he enjoys the irony of the situation. He avoided the official execution ceremony, even though Panem's citizens still take their revenge on him, while Katniss ends up snatching away the victory and power that Coin thinks she has successfully secured.
Finnick Odair was a male victor from District 4 and the winner of the 65th Hunger Games, making him the youngest Victor ever. Ten years later, he was reaped into the Third Quarter Quell, of which he was one of the survivors.
Peeta mentions the idea of lighting a fire in a cold environment while Haymitch shoots it down by saying; "Well that's a great way to get killed", foreshadowing the District 8 female's death as she lit a fire in a dark and cold environment which led to the Career tributes in finding and killing her.
Mockingjay. Johanna Mason developed an addiction to morphling while hospitalized in District 13 for the torture she endured in the Capitol. When she was weaned off, she instead dipped into Katniss's supply.
Peeta used the dyes to paint a picture of Rue after Katniss covered her with flowers when she died. He says he wants to hold them accountable for killing Rue, and Effie tells him that that kind of thinking is forbidden. Katniss then tells the team she hung a dummy of Seneca Crane.
Yes, Katniss did develop an addiction to the morphling, on account of constantly being sedated with it, however, I wouldn't say that she was an addict. An addict is someone who goes to a substance (or whatever their 'poison' may be) under their own mind.
While the Hunger Games film never talked about it, the Catching Fire novel explained why she could only communicate through hand gestures. Katniss briefly mentioned that a previous stroke could have caused Mags' garbled speech. However, post-traumatic stress disorder could have also caused her speech incapacity.
Johanna asks what happened to Mags, and when Katniss tells her she says Mags was Finnick's mentor and half his family. She also explains that she saved Wiress and Beetee because Haymitch told her that if she and Katniss were going to be allies she had to save them for Katniss.
