The traveler's stone - 2

Ron turns towards the entrance of the hidden chamber. "Look at the way the dust is swirling around at the bottom of the stairs." "Yes, the air current is making it move more than the rest of the dust," smiles Sheri. "Do you want me to explain how that works?" "Yes, but not the dust at the bottom of the stairs," states Ron, as he turns to the side. "I would like you to explain the same thing happening over by the wall at the end of the smooth area around those small rocks." Sheri follows Ron's outstretched arm, and there is the same pattern in the dust by the wall.

There are only two areas in the hidden cave below the cliff where the air is moving the dust.

The air in the rest of the Chamber is still because the dust is just falling straight down.