It didn't take long to piece the information Tony gave him together into a relevant conclusion, and what was left of his anger left him, replaced by mild surprise and confusion.

He'd had no idea there was anything left of his original arm under the metal. It was never necessary for him to know, and he assumed everything he was sensing was due to the artificial hardware.

"Oh." That certainly explained the pain. It was doubtful there was enough skin left under the plating and wires to prevent it, should it be touched.