Derek was honestly surprised that they were in an interrogation room together, and not in separate cells, when they woke up. He could only assume that their id's had gotten them this far, though his gun had been confiscated. A glance at Penelope showed that she was relatively unharmed, if disheveled. Her hair was falling out of it's intricate ponytail thing, and she was missing an earring. She was going to bitch about that later, he thought, before turning his attention to the man across the table from them.
Leon Vance. NCIS. Alternate Realities. Derek wished he could chalk this up to an extreme delusion, call Hotch and Rossi, and get the hell out of here. However, he'd been trained in behavior analysis, and could tell when someone was lying. And Vance was not lying. It didn't mean that he trusted the man, or believed him about the rift, but he could remain calm enough to ask questions.
"You're right. I do have plenty of questions." And Garcia likely had more, but he gave her a look to remain silent for now. He needed to be sure of this man's identity before they said anything. "But first, can I see some identification?"