It’s interesting that Rudy claims he wasn’t going to meet up with his buddies in Vienna. Ok, so let’s take his word for it that they weren’t going to meet. They had just met in Stateside, so it’s plausible that he wasn’t headed to Vienna to meet again so soon.
Obviously the was meeting was to be with someone else. Who? Chances are very good it’s the same person they were in Vienna to meet. Who? That could be an interesting thread to tug on.