You are a great and mighty dragon. You are much stronger than those of your smaller brethren who live near human settlements. But because you live in the distant mountains, humans rarely bother you. But now, lying high in your cave, you smell metal and fire and...man. A knight has sneaked into your treasury. And while he doesn't notice you. He sneaks quietly into the depths of the cave. He's obviously a skilled hunter. He would have had a chance to defeat you if you hadn't spotted him first.