Steve didn't have to deal with anything if he would just stop talking and leave Tony alone. His look didn't hit home, Tony's back already turned and hand up to wave away any other asshole thing Steve wanted to accuse him of before he disappeared into his cell and put a goddamn end to it. Good for Captain America, he could keep it together no matter what happened because nothing could get to him, he was perfect and could always see the path of good stretching out before him and welcoming him into God's arms. The rest of humanity needed a fucking break from pretending they knew how to deal with everything every once in a while, and Tony did his best not to show it but Pietro and Steve had to keep grabbing at him and making him feel like this prison's biggest mistake for it. Is this what Wanda felt after Tony snapped at her for her pessimism? Not that he ever asked for it.
The pieces were in Tony's hands before he even realized he had sat down on the cold floor and lifted the fragments to document them in the weak, yellow light of his cell, the already running inventory from his first scan updating seamlessly in the background without compulsion. He only blinked and recognized his moving fingers as one ran along a sharp, broken edge and flinched back. It's mate was here, he could solder it for now...