You see, there was lots same scene in China when I was a kid, when workers built a house, like 3--4 meter high, workers on the ground throw the bricks up to the one high on the plank, good catch for them, and never see accidents, but truely is dangerous.
If metel poles fall off from the cather hand, it will do harm to safety of public, equipment and others.
Safety is critical when it comes to scaffolding.
