That's how I feel about meeting my T. I meet him on my way to or from work sometimes, because his office is halfway between my workplace and the bus stop. And he apparently lives somewhere not far from my workplace, because I've met him in the street that runs past the campus where I work, a few times.

The first time we met I felt a little awkward, but he simply said hello and smiled and walked on, so I did that, too. (Note that he said hi first, so he doesn't have any self-imposed rule about not greeting clients outside his office.) These days it's exactly like meeting any other acquaintance in the street - smile, say hi, walk on. It's actually really nice. I asked him recently what he'd do if either one of us were walking together with someone else, and he said that in that case he'd take the cue from me, and say hi or not depending on whether I greeted him first. Which is exactly what I would have expected, because it makes all kinds of sense to me.