"These scales indicate that this dragon underwent multiple evolutions here or rather, growths."
The white-haired principal crouched down and picked up a broken black scale from the ground. He scrutinized the scale that had no trace of blood, with flames seeming to burn in his eyes. This seasoned old man, whose character had grown steady over the years, couldn't help but get angry at the moment.
"These scales are enough to prove it, but this dragon, unnoticed by anyone, couldn't even bother to clean up these traces. He is utterly fearless, and these bits of garbage that fell from his body were left for us intentionally."
"Well, Principal, we now know that a dragon has infiltrated our academy and even devoured a large amount of the academy's precious treasures, leaving behind its shed body tissue. What next, should we hunt down this dragon?"