anchor.diff:  
         _countDown = 60 + randomInt(120);
       }
  -
  -    _powerBar.rotation = -rotation;
     }
   
     void fire(double r) {
  
positive.code: 
    void destroy() {
      f.playerState.boss = null;
  
      NodeWithSize screen = f.playerState.parent;
      screen.addChild(new Flash(screen.size, 1.0));
      super.destroy();
  
negative.code:     constraints = [new ConstraintRotationToNode(f.level.ship, dampening: 0.05)];
  
      _powerBar = new PowerBar(new Size(60.0, 10.0));
      _powerBar.pivot = new Point(0.5, 0.5);
      f.level.addChild(_powerBar);
      _powerBar.constraints = [new ConstraintPositionToNode(
        this,
        dampening: 0.5,
        offset: new Offset(0.0, -70.0)
      )];
    }
  
    Sprite _sprt;
  