I feel like Everlark's closeness in this scene following the encounter with Finnick foreshadows his importance to their relationship in a way. In Mockingjay, comparing Finnick and Katniss' similar emotional states and worries over Peeta & Annie when we KNOW how much Finnick loves Annie serves to highlight Katniss' feelings for Peeta. It's even more concrete proof that she really is in love him.
This is how I want to be proposed to. Like no joke. I want my boyfriend to drop a parachute next to me with a ring inside.