David was suspicious of my motives. It seems explaining that you take pictures of strangers to interact with new people and work on your photography skills is not seen as a normal motive for doing something like this. I soldiered on and (semi?) convinced him I was simply odd and not evil. While suspicious in the photo, he was smiling by the time I left (coincidence?).
I did position myself so that he had to turn towards the light some. So I was actually thinking more about the photography aspect of things this time. I’ll consider that progress.