The video was filmed by security cameras on a building near which the protesters were gathered. It’s a residential building; it’s quite common for buildings to be equipped with security cameras in the Palestinian territories, both to keep neighbourhoods safe and to film such clashes.
Clashes are very frequent in and around Beituna, because there is a prison and a military base nearby. They take place about once a week. Some are much more intense than the one on May 15, but there are very rarely deaths.
Occasionally Israeli soldiers will use live bullets, but when they do so they generally aim for legs or arms. However, last Thursday, the four targeted protesters, of which two died, were shot in their upper body – either in the torso, or in the back. Therefore we strongly suspect that the army wanted to kill them.
The army’s rules stipulate that live bullets can only be used against rock-throwing protesters when soldiers are in real danger. But when you look at the footage, you can see that the Palestinians holding rocks aren’t a real threat to the soldiers, since they’ve retreated into safe spots.
I do not know exactly why these clashes broke out, but usually, what happens is that Palestinians start to throw rocks at the soldiers. So it’s likely that this is what happened. The army must investigate this matter to find out what caused this tragedy. However, I doubt that they’ll accuse their own soldiers of wrongdoing; this almost never happens.