There is no way i would call it a murder. But there is something wich disturbs me about this and other videos is how do they take it. I mean, i don´t think it´s wrong because of the mess a 30mm causes on a lot of guys altogether, because that´s the job of a cannon and never was meant to be nice. I don´t think it is wrong killing a badly wounded target if you think it is still a threat, i would have ordered that exactly. The thing disturbing about this video and others is the attitude of the crew.
I don´t think we can ask people in middle of combat, once that you think a bit about what combat means, too much beyond what a scared, tired, angry and overstressed man would do, think or feel, but this comms, shows the side of war wich prooves how dark, grim, cruel could you come to be. Or those of the A-10 wich strafed a british Scimitar during the beginning of OIF in wich the first thing he says after knowing that he killed another servicemen was "s**t, i´m goin to jail", or the Apache pilot who, while Hellfiring two Bradley FVs in ODS "I hope those weren´t ours, man".
However, this is something wich is beyond what frivolous activists, wich don´t mean their opinion but wear it as fashioned, or myself, should judge.