At the end of the game when you face your brother.
After the credits you have a boss battle with your brother. He has a shield that you can not get past so what you have to do is when he throughs that big black ball at you you need to use your surge power to throw it back at him.Your enemy will catch it and throw it back at you.You will have to throw the ball at your enemy once more after he throws it at you again.Then he will fall to the ground.You will want to have your lift power so that you can lift the boulder in front of you and hit your enemy with them. If you do this right three or four times you will have defeated your enemy. Oh ya and if you are in critical damage there is a very long hall run to the back of it and you can not be hit so you're able to get your health back.
Added by: AssasinsCreed134 Oct 17th 2007, ID#7381