Great suggestion on videorecording the incident. Also helps with prosecution later, I suspect.
Regarding neighborhoods, I grew up in a nice neighborhood, but I didn't always work in nice places. My work takes me all over this metro area, in good and bad parts. I once witnessed a car screech to a halt beside a young woman. Three men inside, one of whom jumped out, slapped her several times, and dragged her in. They sped off. The whole thing took about 10 seconds. I was across the street and called 911 to give a good description. No way in heck was I getting into the middle of that. If it was a domestic dispute, she'd probably testify against me at the trial!
My neighbors are freaked out, right now. My subdivision was built in the late 70s/early 80s, and it's very common to see people out walking dogs, kids playing outside, families on bicycles, etc. It reinforces one of my thoughts about crime and violence: live where the bad stuff doesn't happen all the time, but keep in mind that bad stuff can happen anywhere.
Respectfully,
Dirty Bob