At the beginning of this clip:
https://twitter.com/MrAndyNgo/status/1298504749633814529?s=20
It looks like Shooter A is talking to the injured man, "This is your firearm right here."
Also, this Instagram account by louriealex
https://www.instagram.com/p/CEWCtCGFgc_/?utm_source=ig_web_button_share_sheet
Caught the pictures of this guy, and has a caption that says: "The fourth photo is of two such volunteers, who were armed. The injured man was also armed at the time he was shot."
Gun battle?