This question already has an answer here:
In the second bonus scene at the end of the credits after Ant Man,
Captain America and the Falcon are shown with a guy they have arrested. One of them says "This would have been a lot easier a week ago." Then the other says "Maybe we can talk to Tony about this.". Then the first of them says something like "Who knows if the chord will allow them to help.".
What are they talking about? And who is the guy they caught?
I realize that some of this may not have been revealed yet, but I imagine that some of it might fit into MCU bacground stuff.