There's something very obviously major going on in this scene, namely Scarlet Witch torturing Vision - presumably as a result of both their abilities coming from the Mind Stone - that it's easy to miss the figure lying at the feet of Wanda Maximoff. They certainly don't look to be in good shape, at the very least unconscious, and the assumption is that Vision is the one responsible for them being like that. Who is it? Well, based on the teams and the glimpse of costume we can get, the smart money is on Hawkeye (who is, I'd venture, the least likely to make it out of this movie alive).