anchor.diff:      progress = 0;
       target = random.nextInt(3) - 1;
       dead = false;
  -    speed = time/1000;
  +    speed = 1/(1000*time);
     }
   
     void hit() {
  
positive.code:       hit();
        dead = true;
      }
    }
  
    void draw();
  
negative.code: class PaperBall extends Throwable {
  
    int target;   // -1 = left, 0 = center, 1 = right
    num rotationsSpeed;
  
    PaperBall() : super(1, 5) {
      rotationsSpeed = random.nextDouble()*8-4;
    }
  
    void draw() {
      num w = 70 / ( 3* (progress + 0.1)) + 20;
      num h = w / 143 * 117;
      num x = 400 + target * 200;
      num y = 100 * (3*progress - 2) * (3*progress - 2) + 200;
  
      bufferContext.save();
      bufferContext.translate(x,y);
      bufferContext.rotate(rotationsSpeed*progress);
      bufferContext.translate(-x, -y);
      bufferContext.drawImageScaled(images['paperBall'], x - w/2 , y -h/2, w, h);
      bufferContext.restore();
    }
  
  }