the dirt kicking skip(rooster scratching the ground is a good description) appears in our Hung-Ga spear as well. It is always seen with a retreating,covering movement,followed by an abrupt attack.
I also learned a Hung Kuen set that had the two hands slapping the ground,grabbing dirt and throwing it, again followed by a retreat into a counter attack. It can also be interpeted as slamming the opponent's head onto the ground, which is one of the throws in our style as well.
I just don't like the fanciful technique done three times. But, I also don't like the galloping movement in my Guan-dao set either.