Chris Evans says the fight scene where Bucky and Steve toss Cap's Vibranium shield back and forth to beat down Iron Man was one of the trickiest scenes to shoot in the film. "That's CGI. It's too impossible to try and navigate actual throws like that and get the shots you need. That's the tricky part of the shield in general. Sometimes you have the full, real, heavy shield and sometimes you have the foam shield if you have to hit someone in the face, sometimes it's no shield when you have to do really acrobatic things with it. During that one, it was a lot miming and really tricky to go back and watch playback [and realize], 'Maybe I threw too soon or he caught too late,' you really have to make sure, even in your miming of the exchange that the timing is still there. That was one of the trickiest scenes in the movie."
That fight scene was definitely the wow moment of the previous trailer but if the early reactions are any indications, it's just the tip of the iceberg of what Marvel has in store for fans on May 6. A certain insect is said to have an especially spectacular fight scene.