This sound was very faint, and if a human were listening, it would be easy to mistake it for the crashing sound of a crane outside the window.
The human ear has a high level of discernment within its receivable frequency range. In addition, Elliot had an artificial cochlea installed to prevent hearing system damage from factory noise.
With the AI-grade analytical capability, Lille could clearly discern:
There was something moving in the office building; someone was here.
Elliot nervously glanced around, reached out, and picked up a broken iron rod from the ground, which seemed to have fallen from a jack. It felt solid and heavy in his grasp, but he could still swing it—
He was fat and indeed not agile, but it wasn't pure flabbiness.
Lille was very satisfied with this action; at least now he knew how to defend himself.