Old Dragonball Z RPG House Rules 2

Knock Back
Physical Attacks (Punches, Kicks, Weapons, Physical Techniques, etc...)
Subtract the number of the attack dice from the Target’s physical characteristic + 1d6. The result is the MOVE distance of Knock back done. The target is knocked down if the resulting MOVE exceeds their Physical.

Energy Attacks
(Laser guns, Chi blasts, etc...)
Same as physical attacks, except that you take 1/4 the attack dice of the energy attack from the Target’s Move characteristic + 1d6. Deflection prevents knock back if it successfully resists the attack.

Collision Damage
When two objects collide, the damage is 1d6 per every 2 MOVE (10 ft.). So a person that is punched, flies 10 ft. through the air and hits a tree takes 1d6 damage. A person that hits a tree after being thrown 35 feet back takes 3d6 damage. Collision damage ignores defense.