Not being an Expert on such matters, I would imagine that the flat front of the truck would have scooped up the kid and pushed him along the road, coupled together with the fact that the kid changes his mind and tries to turn back for the verge and away from the truck AND the reactions of the Driver have saved his life, rather than get dragged under the Vehicle and along the Road. If he'd been hit by a car then you would have been looking at a very different outcome.
It's worrying to think what goes through the mind of a bored child during half-term week, that they think that this would be a "Laugh." Personally, I'd take this footage into all the local Schools in that area, on Monday morning as part of a special Assembly, and make all the kids watch it, to demonstrate how stupid all those in the video have been.