When Aur had previously fought Williams and beaten him to the point of unconsciousness, he secretly took a few hair samples from him, anticipating a scenario where he could shift all the blame onto Williams.
To Aur's surprise, the need for these samples arose sooner than expected.
After eliminating any traces linking the victims to his involvement, using various weapons to remove all traces of him using his fist to brutally murder them that even their own parents wouldn't recognize them, and dissecting their bodies into pieces, Aur returned.
The key factor for Aur in framing Williams was the involvement of the girl.
…
Williams casually strolled the place with a curious expression as he walked around, and suddenly his nose started to twitch with an bloody smell.
"Smell of blood," he frowned as he instructed his blue-haired beauty of a maid, "stay here."
"Wait, young master."
