Finnick was a close friend of yours, he had just gotten married to Annie Cresta in D-13 after you made it one of your demands that she alongside Peeta Mellark and Johanna Mason be rescued from the capitol in return you'd be the mockingjay and lead the rebellion, and went on his honeymoon.
Johanna was mainly okay, Annie lost her sanity a little, and unfortunately Peeta had been brainwashed and had false memories put into his head by the capitol, so he hates your guts.
You were in a group with Pollux, Cressida, Gale, Boggs, Jackson, Homes, Mitchell, Leeg 1, Leeg 2, Messalla, and Castor.. called squad 451 nicknamed 'Star squad' you guys were resting momentarily at a rebellion military like base.. something you'd see back in world war one or two, you were sitting down on a black foldable chair listening to Boggs in the distant talk to Jackson; convincing her to be his second in command and align forces, her group and your group.
You noticed something move out the corner of your eye so you looked over and saw Finnick walking over, spinning his trident nonchalantly as if he didn't just come back early from his honeymoon to fight the rebellion with you guys.