Thread:Uncanny X-Factor/@comment-5041674-20151125235353/@comment-5041674-20151126000833

On the other hand, Cap breaking the law only for his friend, while selfless, is a bit extreme, too.

Also, we know more on Black Panther's reason for joining Stark: Bucky blew up part of a UN meeting, killing T'Challa's father. So basically, Black Panther wants get vengence on Bucky.