John nodded in understanding, and even managed a small smile at the mention of the Jedi. It is so surreal, realising that they are only a fiction in his reality, and yet very real somewhere else. He's surprised that he's just become used to such strangeness.
"Yeah, so I heard," he nodded. He would go along, if it would help. He wished Sherlock was there- he would know where to look. "I'm John, by the way. John Watson," he introduced himself, leaning over to offer a handshake. It's only polite.