The story is still unfolding, but it appears a rejected customer at a local nightclub in a tough neighborhood decided to vent his spleen by slicing some other customers open; one of the stabbing victim's friends took exception to this initiation of force, and shot the stabber.
Bottom line: the knife-wielder is dead. The stabbing victims are in hospital, expected to recover. The presumed shooter is in custody, having surrendered to police when they arrived. I can't get the online video at the link to play but from what I saw on TV -- calm conversation between alleged shooter and police officers -- and what police have said ("He [stabber] lashed out at the wrong group..."), this looks more like an appropriate response to a violent fool than some kind of gang squabble. If it is the first, job well done! Either way, perhaps it'll give the next malefactor something to consider before he tries expressing his precious frustration by initiating violence.
N.B. My post title is meant wryly, as this sort of happening isn't "justice" in the usual sense; nope, it's the same thing you do when a rabid dog shows up and takes after folks: you stop it. Justice is what happens afterward and we're still waiting to find that out.
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