Oh my God. This chapter was so sweet and sad and suspenseful!

"And I'm hoping they don't know what hickeys mean, because I think that would probably hurt my cover more than it helps it."
Tony needing Steve to hit him was like a twist of a knife. Of course he'd joke about it, though. It was so painful to hear him think that Steve was worried he'd spill under torture, when it's so clear that Steve just wants to know that Tony will survive.

"Good luck, Highpockets," he said, the silly, old nickname feeling awkward in his mouth. "We're counting on you."
You capture somberness so wonderfully. That scene felt so cold and gray, the nickname felt awkward before I read that it was awkward, if that makes sense.

I don't even know what to say about the duel! Typically, fight scenes don't interest me. This one was an exception, safe to say.