The Pali bullet-spraying event was posed/staged/planned, IMO, but the anguish on the face of the guy in the aftershot shows they weren't expecting any serious return fire.
Ricochets can kill cleanly, can't rule it out -- but I think a rifleman squeezed one off from an elevated position.
Your idea makes sense. I hadn't considered that maybe the Pali's got surprised by return fire during a photo-shoot.