Before he rescued Peeta, Katniss saw Finnick as a threat and someone she will eventually have to kill. However, she admits she will never be able to kill him because he saved Peeta. She won't be able to look past the debt she owes him for saving Peeta's life.
In a way, Finnick has outsmarted Katniss here by saving Peeta's life. Now Katniss "will never stop owing Finnick." He's done her the kind of favor she can't easily pay back; now she can't let him down.
Katniss doesn't trust him at first, mostly because Finnick is very flirtatious and seems to be working an angle. But as they work hard to survive in their second competition, Finnick becomes an ally who joins the revolution.
She expected their years of friendship would make it harder to kill. But she knows her one and only true ally is Peeta, so she decides she must kill Finnick now. Katniss climbs down from the tree, determined to kill him now before he has the chance to kill her.
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.
The Life of Finnick Odair: Hunger Games Explained (From the Books)
Was Finnick flirting with Katniss?
However, he tells Katniss that his admirers pay for his company with secrets, suggesting a depth to his character that perhaps not many people get to see. Finnick's flirting with Katniss is harmless enough; however, their interaction in this chapter foreshadows more to come.
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.
Finnick was willing to give up Mags to save Peeta because he needed to, to convince Katniss they were on the same side. He receives a large cut in his leg when he was trying to save Peeta. During the events of Mockingjay, Finnick shows concern for Peeta, and goes out of his way to save Peeta's life again.
After winning the games, Snow forced Finnick into prostitution and sold his body to Capitol residents to gain their trust. Finnick only agreed to take part because Snow threatened to torture his loved ones. Even though he bedded several women throughout his time as a victor, Finnick's love for Annie remained true.
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. Like the other victors, she knows the power that Katniss has as a lightning rod for the rebellion, and she knows that Katniss will not help without Peeta.
At an unknown point in time years before the 74th Hunger Games, she was personally fired by Snow, the stated reason being due to her being too surgically enhanced.
Finnick learned many secrets, including that Snow, in his rise to power, poisoned his adversaries but to divert suspicion often drank from the same poisoned cup followed by an antidote that only Snow used. Segments of the propo of Katniss and Finnick are aired.
The only information the audience has about Katniss' future is that she and Peeta have a child together 15 years after their experiences in the Rebellion (at 33 years old) and that five years later, they have a second child.
He explains that Peeta came to Haymitch to beg for a chance to go back in the arena and to take his place should Haymitch's name be drawn at the reaping. The two agree to work to keep Peeta alive since he and Haymitch worked to keep Katniss safe last time.
It's a horrifying death, though Katniss puts him out of his misery when she sets off an explosion in the sewer to free him of his pain. At the time of Finnick's death, he was either only 24 or 25, making The Hunger Games loss even more devastating.
As a Career tribute, Finnick won the 65th Hunger Games at the age of 14, where he was mentored by the previous District 4 victor, Mags. During the 74th Hunger Games, he served as mentor alongside Mags for District 4, as revealed in Mockingjay when he became the expert on Peeta's memories of his two times in the arena.
One of the more tragic things about Finnick's story is that, upon winning the Hunger Games at just 14 years old, President Snow forced him into prostitution to exploit the Capitol's obsession with him, threatening the lives of Finnick's family members should he fail to comply.
After winning the games, Finnick was forced into prostitution by President Snow. He was blackmailed into going out with wealthy citizens of the Capitol for the safety of his loved ones, such as his District 4 sweetheart and fellow victor Annie Cresta (Stef Dawson).
Katniss here's this and understands that even though she may not love Peeta (then) that it's one less person who has to die. (At least that's what I have always thought.) Katniss realizes that if she pretends to be in love with Peeta people will want the capitol to let them survive.
The following year after Lucy Gray Baird's victory, another female tribute emerged as the Hunger Games winner. Mags Flanagan became the first victor from District 4, living off of nuts and her survival skills by creating fishhooks. She was also the first victor to move to Victor's Village before serving as a mentor.
What does Finnick do when Peeta gets electrocuted?
Later, after Peeta gets shocked by the force field and his heart stops, Katniss doesn't know how to help him. But Finnick revives him, causing Katniss to recognize that, without Finnick, Peeta would have died.
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.
Seneca Crane was the previous Head Gamemaker, who was executed for allowing two victors. Katniss painted his name on a dummy and hanged it to warn them that they're not safe and the same thing could easily happen to them.
Catching Fire's Mags Flanagan was District 4's female tribute in the 75th Quarter Quell, along with male tribute, Finnick Odair. At 80-years-old, she was the oldest tribute.
