I suggest that you people carefully study the video and decide at what point the boy was shot and by whom! That Ground Up can say they saw the boy being shot is taking literary licence to an extreme level. 
I do not deny he was shot but when and by whom is some thing else. St least 3 policemen fired in that general direction even through the smoke which tended to obscure possible targets. No forensics can prove which shotgun was used -shotgun by the way not rifle as the photographer claimed. Which goes to experience and knowledge when making such statements. 
Not that I hold with indiscriminate firing in such situations but yet the Police are armed with a 12 bore anti riot shotgun cartridges which are so weak you need to be within 15m to achieve anything like deterrence where as now the rioters are throwing half bricks and rocks from as far as 40 m and if they hit you a broken leg could result. It is no joke being stoned by hundreds of people and you must get within 20m of them!