Lesson Learned...
Coming back to work yesterday after lunch I watched a customer driving one of those UTV things (they're legal to drive around in on the streets in town where I live) pull forward out of a parking space between me and the spot where I lock up my bike. He'd pulled to the edge of the street, stopped, was looking around I guess for oncoming traffic before pulling out. Had his window rolled down so I shouted "DON'T BACK UP!" just as I'd made the decision to go behind him rather than in front....
'Course he started BACKING UP as my front wheel got behind his left rear.
(I'd left ample room for this but it was still rather unsettling despite the clearance as I swerved even farther to the right to clear his intended space.)
I don't think he ever looked at / saw me coming from his left before he reversed.
In hindsight I should have STOPPED when I saw him even though he'd been stopped at that point. In trying to guess whether he'd pull forward I'd discounted the possibility he just might back up.
I'll remember this little episode, I will.