Alastor Moody knew that people took one look at his scarred and pitted face and instantly saw a man who had fought for most of his life, they would be correct in thinking that. However Moody also knew that some people looked him and saw a infallible and invincible being. A man who had seen and fought in too many fights to count and yet had walked away from all of them alive. A man who although they could see how damaged he was chose not to acknowledge and instead preferring to think that he came through every fight with ease because it gave them comfort to have someone who looked like he had already lived through the worst the world had to offer and yet had still come out to ensure the safety of others.
If Moody every heard someone talking like this his blood would boil and he would suddenly have to fight to remain in control of his emotion. What these people did not seem to realize is these scars did not represent very time he won a battle, they show every time he nearly lost.