anchor.diff:      progress = 0;
       target = random.nextInt(3) - 1;
       dead = false;
  -    speed = time/1000;
  +    speed = 1/(1000*time);
     }
   
     void hit() {
  
positive.code: class PaperBall extends Throwable {
  
    int target;   // -1 = left, 0 = center, 1 = right
  
    PaperBall() : super(1.5, 5);  // 1/1000 progress per millisecond = finished in 1 second
  
    void draw() {
      num w = 70 / ( 3* (progress + 0.1)) + 20;
      num h = w / 143 * 117;
      bufferContext.fillStyle = '#F00';
      bufferContext.drawImageScaled(images['paperBall'], 400 + target * 200 - w/2 , 100 * (3*progress - 2) * (3*progress - 2) + 200, w, h);
    }
  
  }
negative.code:       hit();
        dead = true;
      }
      print(progress);
    }
  
    void draw();
  