Steve had never heard of a pocket dimension before, but he'd heard of some pretty strange and unusual things. So it wasn't too much of a stretch for him to understand what that might have meant. An alternate reality. His mind was trying to wrap around that when she motioned to the key card he was still holding. He glanced down at it, too.

"Uh... yes. Yes, I do." Steve had been using them since he'd woken up in the twenty-first century. Hotels used them, and he'd had one to get in and out of the Avengers building. "You seem to have some idea what's going on here," he added, turning his attention to her. "Can you tell me how they knew I was coming?"