I had a full helpful reply written out for you & it got deleted ≽^╥⩊╥^≼
Short answer: Cain is looking for Silas, has no idea where he is, & has no idea Arthur knows him. In the course of becoming aware of Arthur, Cain realized Arthur's real good at his job, so he's testing him. If Arthur's as capable as he seems, Cain plans to make him help him find Silas. Cain's true obsession is Silas, he has a mini fixation on Arthur as a useful (& attractive) tool that could help him get Silas back
Ooooooh that makes so much sense thank you love can't blame him for being obsessed I mean it's Silas and Arthur
I'm so glad you found it helpful!♡
What exactly does Cain want from Arthur??? Like I'm kinda confused does he know Arthur is associated with Silas or something????