I do not currently have my own game's screenshot for it, However, Someone else does, Lazy, On the Wikia!
(Just use the "Image?" linking directly to wikia image as an image just doesn't seem to work well at all)
As for "Stuck leaving" I'm not entirely sure "how" it managed to occur
If you look up at this picture - Where the player is standing? That's about where the NPC was stuck... Just "standing" there... Not entirely sure how or why.
It was the same customer in my experience, (by looks at least) as the one I'd given up on and had not only knocked an item at him, but had a sword sticking through him as I closed the shop - And I myself, was extremely close to them, potentially in their way as well
and then I quickly turned after closing the shop (not closing the door) and ran off to do my own stuff, some time later I came back and saw him standing out there, spooked me, cause of his proximity to store... He was gone after reload. (I slept, saved, and quit, and reloaded just to ensure he didn't get in the way of other customers.