“This Is The Fight Of Our Lives”
Cap’s speech ends with the rousing words: “This is the fight of our lives.” The next clip then finds Steve with Natasha on a quinjet. Apparently, they’re on the cusp of diving into some big move to correct what’s happened. “This is going to work, Steve,” Black Widow assures him. A tired-looking Steve replies: “I know it is. Cos I don’t know what I’m gonna do if it doesn’t.”
This is a hugely ominous scene, given that we all expect Chris Evans to hang up his shield for good after Endgame. And from his voiceover and this line, it seems like Captain Rogers is really going to give this battle his all, in order to presumably reverse what Thanos has done to the universe.
Also of note is the fact that this scene opens with Steve looking at his compass, with an old picture of Peggy Carter inside. This is a neat callback to Captain America: The First Avenger, bringing Cap’s journey full circle. But it could also be setting up a widely-theorized ending for the character: that he’ll travel back in time and return to the 1940s to be with Peggy.