/**
* The method sets the propulsion yield of the projectile.
*
* @param worm The worm who has the weapon equipped.
* @post The new yield of the projectile is set. | new.getYield()==worm.getPropulsionYield()
*/
@Raw
private void setYield(Worm worm) {
this.yield = worm.getPropulsionYield();
}
