That would haunt me, too.
Im the woman who once hurled a handbag I was carrying at a little grey and white cat, to scare it out of the road where it was washing, oblivious to a car approaching. The poor cat looked SO surprised when my bag came flying past!
Like most women, my handbag holds all sorts of things and the car squished the lot .....
Thank God, though, the car may have wrecked the bag and contents but the cat was OK.
Maybe the person going into the shop didnt know they were being followed. Maybe it wasnt their cat, but the cat thought the person was his owner?
I do hope kitty picks up some road sense soon - The road is a very unforgiving playground, as well know too well