In this chapter, we're introduced to the concept of "sealing the spirit artery" , which is a fancy way of saying that you can't defeat the enemy until you stop him in his tracks. In other words, you can stop the enemy from attacking you until you've killed him. This is a nifty little trick, but it's not really a game-winning one. It's just a nifty way to make sure that the enemy doesn't attack you in the first place. In this case, that's because you're blocking the enemy's path to the heart of the universe. So basically, the enemy is blocking the way for the other guys to attack him in the future. The only problem, of course, is that you'll have to kill the enemy in order to do this. That's a lot of work, isn't it? We'll get to that in a sec.