You don't understand basic words. In place of self-defense, you've projected the word "murder".
What grade of elementary school are you in? What level of brain-damage do you have? What's your age? What's your IQ?
A lot could be explained if you answer these honestly.
No one said he was partnered up. No one said he was part of the militia.
He was there to protect family's business, and to offer medical assistance for tear gas or pepper spray, there's no required designation, no one said he was some kind of well-trained "medic", he was stating "does anyone need a medic" for tear gas and/or pepper spray, obviously you don't understand.