FWIW
here is how the cameraman viewed the situation.
Quote:
The Marine then abruptly turns away and strides away, right past the fifth wounded insurgent lying next to a column. He is very much alive and peering from his blanket. He is moving, even trying to talk. But for some reason, it seems he did not pose the same apparent "danger" as the other man -- though he may have been more capable of hiding a weapon or explosive beneath his blanket...
At that point the Marine who fired the shot became aware that I was in the room. He came up to me and said, "I didn't know sir-I didn't know." The anger that seemed present just moments before turned to fear and dread.