Best wishes for a rapid recovery! Sorry to hear about the scrap.
When I lived in Scotland I saw a bit of that sort of thing, and was threatened myself on a number of occasions. Once, while walking past a car park, an orange traffic cone was hurled at me from the top of the car park (about 40+ feet up). It missed. Never saw who threw it (it was dark, and I didn't realize the cone was inbound until it landed a few feet in front of me, so by the time I looked up the assailant was gone).
Another time, I was standing in line at the Odeon on Guy Fawkes' Night. Watched as a car drove by and someone pitched a lit cigarette out the window, which rolled to a stop at my feet. Only it wasn't a cigarette, which I realized as I'm looking down at the firecracker just as it explodes. Felt the pressure wave hit me, got powder burns on my trousers, and suffered some temporary deafness (about 4 hours) followed by a few days' worth (at least) of tinnitis. I would have given chase, I was so incensed, but the car had already sped off down the road.
Was standing on a street corner with a few other friends, one of whom was a gentleman from Cameroon attending medical school at the University of Edinburgh. We had just come from a party at his flat and were waiting to catch a bus when a couple who were arguing fiercely approached. They were so loud, and so enraged at one another, that we couldn't help but notice. The man wasn't too happy about that, and wanted to know what we were looking at. There followed the worst string of racist invective I've ever heard. It was clear the man was drunk. There were six of us and one of him. His girlfriend, slightly more sober and better at judging odds, I reckon, pulled the man away and hussled him down the street. It never came to blows, which was probably a good thing for that guy.
And there were countless stories of folks receiving the "Glasgow kiss" on Friday nights a few miles to the west (I was luckily not one of those).
Good health, and good defense to you, Al!
Warrior Poet