Not this "Oh noes! Our leader has been hurt. How do I use a weapon again???" That just felt unauthentic to me. Like I said, practically speaking, there's no way Rick, Daryl, Michonne, and Carl all make it out of that alive.
While I don't buy it in those movies with entire armies bowing down because one leader dies, when its that kind of situation where someone with all those rules that Joe had dies, I can kinda see his people being stunned by someone who was able to best Joe.
I'd say the more unrealistic thing is that Joe just didn't shoot first, but then again, I'm sure it had to do with his rules, and wanting to get even for the guy that got strangled.