Why do you think so, if someone is being shot SEVERAL times in the back, nothing happenend??
It seems to me that there is more happening over there. My source is The Economist" and they do not think it is an incident, as well as other sources like Westpapua Netzwerk, there are a lot of people being shot in that neigbourhood in the passed time. That seems more than an incident.
And case closed???... Are the offenders being caught, they went away in 3 cars? I do not know, but if the suspects are in the indonesian army, cases are often in advance being closed, as you suppose!!
Maybe you can be more accurate in formulating your opinion, it is more wishful thinking.