"You didn't leave me behind. You've never left anyone behind." He's getting a little heated, but he's not mad at Cap. He's mad at this attitude of his, even if he recognizes exactly where it comes from. Tony reaches out, fingers gently prying Steve's apart. "I don't even have to know the specifics. Because I know you." Well, sorta. He knows the idea of Steve. He knows what his father knew. He knows what he's read. His face falls a little, and his hand drops to skim along the other man's wrist before falling away entirely.
"At least, I think I do." Once in a lifetime shot to correct Tony Stark without consequence.