I think the only thing I may have done differently is stay inside and observe. If I did have to go outside to observe, I would have remained out of site.
IMHO; there is no need to "expose" yourself needlessly. (To a BG or the police)
However, it sounded like a good LEO encounter under the circumstances.
It could have gone REAL BAD exposing yourself to the BGs!
Did you find the person who was shot?
Did you render any aid?
Have they caught the shooters?