You throw the first one at him and it bounces off his armor. He turns and comes toward you. You throw another dager, and another, and another. They just bounce off his armor. You have one more dager you take aim right between his eyes. And then he kills you.
Sorry. but dont worry you can play again. Or you can be a sneaky little cheater and hit the back button like you've done the whole game. And if you aren't one of those people then you need to go see a shrink. Why? Because your lying to yourself.