This is a particle effect I made to use for when characters where landing on the ground after a jump.  In the video, you can see it emit at Amina’s feet.  Unfortunately, we did not have time to put it in the game.  It’s “in game” in the video simply because I hooked a few things up in UDK, but were it to have actually been in the final build, the particles would have only appeared when characters landed on sand (not on metal or roofs, for example).