My Name Is Legion wrote:
It doesn't look to me like the pebbles are floating - it looks like they're bouncing and rolling. As if the earth is shaking beneath him as he tenses and braces himself to leap up. In the shot down from above, the ground has cracked open.
Which would be pretty cool.
Watch it again. The pebbles slowly rise around him, start going faster the higher they get, and at a certain point, they start circling. They're definitely not bouncing up and down, they're floating.