Simmons loses her breath for a moment, the guilt and intense emotions making her forget that she's not supposed to tell people that, especially not the Avengers. Her face works through worry and a variety of fearful places before she thinks the damage is done and maybe she ought to tell the truth. "Agent Coulson, yes," she agrees. "I wasn't supposed to say anything, I know he would want to tell you himself, especially you, sir," Simmons says, given how Agent Coulson feels about Captain America. "I don't know the details, I only know that somehow, he's absolutely fine. I know, I ran the tests myself."