Gyro_Force_AddProperty_GroundPound(entity force)
Use this function to apply the ground-pound property to a given force. Once applied, the force will only interact, via a FL_ONGROUND
check, with objects resting on the ground. Airbourne, floating or otherwise non-grounded objects will be ignored completely. This property may be used to simulate earthquake effects or ground-based shockwaves, for example.
Gyro_Force_RemoveProperty_GroundPound(entity force)
This function will remove the ground-pound property from a specified force.