You can see "stripes" on the floor, ceiling etc. where the blades are throwing the coolant/dust suppression liquid, probably just water. It is very effective at reducing dust. If the water is directed at the proper spot, there is almost no dust at all, just a slurry running down the wall.

As for being cut to pieces, it is not like a saw blade where contacting your clothing or skin will "pull" you into the blade. The diamond blades not sharp at all, it would certainly wear a slot in your skin, but would take a while to cut anything off.