the world goes bright for a second as something clubs me up side the head , right on the sore spot where aaron punched me , and i fall over but as i 'm falling i swing the knife up and i hear a little yelp of pain and i catch myself before i fall all the way down and i turn , sitting down on the ground hard , holding the back of my knife hand to the pain in my head but looking at where the attack came from and it 's here that i learn my very first lesson : things with no noise can sneak right up on you .