Red, white, blue, and a soldier. The only one who fit that description that Loki knew of was Captain Rogers. (The few seconds he'd spent annoying Thor by playacting the Captain were still treasured hilarity to him.) There was nothing to say that they were from the same universe, he and metal-arm, but if they were?

They had at least one common frame of reference. Good to know. "Sadly, no. Not in any permanent way."