Meeting an old friend in a different country

I am American and went to high school in the US. While I was in high school, there was a German exchange student one year, named Franz, who was friends with me and other friends of mine, including one named Justin. When I was at university, I spent a year in the UK, and while I was there, Justin came to visit me. We went to London for the day (I was not living in London that year) and visited the British Museum. While we were there, Justin was saying that he wished he had been able to go visit Franz in Germany, but there was not enough time on the visit. He had not contacted Franz about his trip. Shortly after this conversation, we rounded a corner in the museum, and found Franz walking towards us. It was so surprising, it was quite confusing initially!