C.J. Walker drives so hard on this slam dunk that his defender can't keep his feet.

Ground Slam: Jump up high into the air and crash down on the ground ahead. The resulting pratfall sends a powerful shockwave in all directions. "Ground Slam: Jump up high into the air and crash ...

This means that you can only buff the shockwave or the slam separately if you use Physical or Holy damage boosters. Note that this skill inflicts more damage than the Ground Slam, something around ...