Caelum's impression of Michael was quite peculiar.
Aside from his strength, which left the greatest mark on him, Caelum saw the seemingly innocent looking youth as a very witty individual.
Witty, not in the sense of being sly, cunning, or scheming, but in the sense that he was remarkably slippery.
Slippery did not make Michael a bad person. Far from it. But it did show that Michael was not simple. He was not someone who could be read at a glance or cornered easily.
One could see this clearly from how Michael had survived not just one near death experience in Hell, but multiple. Each time he was pushed to the brink, left with barely a sliver of life, yet he always managed to escape. Not only escape, but somehow twist the situation to his own advantage.
Caelum had personally experienced this himself.
