The showing of Clark sparring was one that the elves were all shocked by. His movements were like a domineering specter. The dragon energy appearing when he struck out while a more mysterious shadow like energy appearing when he dodged to sneak in to their blind spots.
Things only got worse as they began to feel a literal aura of death coming from him. Jasmine's guard had recalled the time that she had first seen him. But the second, how this threatening energy had grown. Now she understood that it seemed to grow by the second.
The energy of this human, was not something static. He appeared to be getting stronger while making every single movement. He appeared to be deepening his bonds with his partners at every single breath rather than slowly doing so over time.
Creation is hard, cheer me up!