It was interesting watching the officer approach the car. She walked between the vehicles at an even, confident pace, reaching back with her left hand to check the presence of something she carries on her belt at her back. Maybe a holster, I couldn't tell. As she approached the driver's side door she slowed with caution, and she stepped in front of his window almost with the snappy motion you see in movies when a cop turns a corner of a building, half-expecting fire. It was subtle, but it was there.
I wouldn't have expected such caution on a wednesday morning in Ann Arbor. Maybe it's by the book. Maybe she had some reason to be suspicious. Maybe his getting out of the car before was reason enough. She went back to her car and wrote him a slip of paper and they're gone now. But it was interesting to see her move like that, so alert and ready to react, like a brief glimpse of a panther among housecats.