Theft!

Detective Watson and Sean simultaneously disappeared from their spots. What followed was a brief moment of silence. And then…

CLASH!

Sparks flew out from one corner of the battlefield, and following that silence ensued once again.

CLASH! CLASH! CLASH! CLASH!

Dozens of sparks were produced, what seemed to be out of thin air, at various parts of the battlefield. Meanwhile, Detective Watson and Sean were completely invisible to the naked eye.

More precisely, they were invisible only to a regular human's eye! Both of them were moving at such extreme speeds that they appeared to be not visible at all.

Bryan who was hiding in the shadow of a tree, away from the battlefield, was 'looking' at the battle between his teacher and Sean. It would be more fair to say he was looking at the sparks flying around on the battlefield.