When shooting in competition, it's important to keep your goggles on even when you are not the one firing as a catastrophic failure of a firearm elsewhere on the line can cause shrapnel with substantial energy to be delivered in your direction.
The POV of the footage is almost exactly where a 3rd shooter might be positioned during a CMP match and as you can see in the video below, when this M-1 explodes there are parts of the receiver flying directly toward the position where we can imagine a 3rd shooter:
