"He was brainwashed. Or... used, somehow, when Loki took the Tesseract."

The past twenty-four hours are getting to him. He's feeling the empty rattle of lost adrenaline on top of too long on high alert. "He knew the helicarrier and he knew SHIELD. Natasha -" He tilts his head, surprised at himself for the informal address. "Agent Romanoff caught him and brought him in. So yeah, she trusted him and I trusted her - and then I saw him fight, and I saw him pull a little boy out of a bus and usher civilians to safety. He fought with me, and I trust him. He's going to need people who trust him over the next few months, I'm guessing."