Have you ever wondered why Barton was the only one wearing dark sunglasses in that scene?
What did he have to hide?
It was probably sunny out, so he put on sunglasses. It’s what real people do when they go ‘outside’. I know, it’s hard for the ordinary fangirl to understand: it’s taken me a while just to grasp the idea of ‘outside’. Don’t even get me started on the ‘sun’.