Basically they're trying to stop Cap and Bucky from getting to a Quinjet that they need to use to get to Siberia to stop Zemo. Ant-man and Spiderman steal the show. Rhodey suffers severe injuries that affect his ability to walk courtesy of an errant blast from Vision. Black Panther shows off some badass moves. Again, it's not a fight where they're looking to hurt each other. Widow switches sides the moment Cap and Bucky get to the Quinjet and BP was closing in on them. She's the reason they evade BP.