Unfortunately it looks like some wannabe mall ninja(seriously this story says he's former security) got lucky enough to not get shot or arrested for making a citizen's arrest of one druggie who shot another.
Hands up how many concealed carry people also carry handcuffs? This smacks of someone "patrolling" for a chance to be a hero.
Listen Skippy, this could have gone wrong in a whole lot of ways. It can still be made to look like concealed carry holders are nutball vigilantes, because you with your handcuffs and "citizen's arrest" look like a nutball vigilante.