thats the head, its in the lower region, its like a weapon of doom, if u touch it, it destroys what ever it touched, i put it in the middle, so it won't be as easy to use.
I am going to aswer both those questions, the head is in the middle, so if your opponent gets to close, you move your head forward, and it becomes a weapon, the fact it has a joint allows it to move back and fourth, making it a usefull weapon.