Damn, that is just gut wrenching. Just horrible, Rest in Peace. The screams are just so terrible.
It looks as though multiple objects/bricks bounced out of the back of the truck. If it's an unsecured load (which is how it looks), the driver is at fault for not securing the load properly, in Australia anyway.
i almost drove over a brick lying on the road once. i was lucky enough to evade. don't know what would have happened to my wheels if i didn't. that was at a speed of roughly 70 km/h. now, i'm happy i was nowhere near when it fell off the truck that dropped it there.
BTW, it is the driver's fault if he does not care to secure his cargo. according to german law at least. Probably also according to russian law...