Every time I see this clip, I notice that the dust settles very quickly. The fine dust should be kick up a big cloud of dust. Ever drive behind someone on a dry dirt road? It takes a min or 2 for the dust to settle here on earth. It should take alot longer to settle on the moon, but it doesn't, Why is that ????
To a dust particle, air is very viscous (thick). This is also why a dandelion seed or a feather floats to the ground. Add in stray air currents and it is no wonder that dust kicked up on a dirt road on earth may take many minutes to settle.
With no air on the moon, the time it takes dust to fall is dependent only on its momentum and gravity. Kicked dust travels in ballistic arcs, such as you may see if you kicked a pile of BB shot. The dust stays in the "air" only as long as it takes to travel under lunar gravity - Which is longer than earth's gravity but not as long as it would be up if there was air supporting it.