Legitimate kill? Appropriate behavior?

A little background. First, read the warning by Rolling Stone. Second, the patrol already had an argument with the driver of the Honda. Apparently, he left, darned a tactical magazine belt among other things, got a buddy, and came back to start some shit. It was sort of a bad decision on their part. Coming back to the patrol. Anyway, the soldiers secure the area and then check out the scene.

http://www.rollingstone.com/politics/photos/motorcyle-kill-20110327