This was all a bit..crazy. And that's an oversimplification.
This document the UN brought up, signed by over a hundred countries, demanded that all superhuman or superhero activities be surveilled and kept under their control. What a joke. That's how the Avngers split up—divided over opinion on it. And that's how Anthony Stark was at your doorstep, asking you to join the battle against the others who didn't wanna sign.
So, now you were at an airport in Germany where those who didn't sign were—including James Barnes.
A fugitive that had been accused of the bombing at the UN that killed the Wakandan king that came before T'Challa. And a former Winter Soldier. What a combo.
You and Peter Parker, aka Spider-Man, were just waiting for Tony's signal to finally swing in—and then it came.
"Underoos!" Tony shouted. That was when you and Peter swung in, taking Cap's shield with his webs.