I definitely prefer this theory over so many people thinking that guy is Sebastian's "Past Lover" or whatever ( ദദ ˙ᗜ˙ )
He called him Demon, though. Plus, they aren't THAT alike really.
Ik but what if he meant figuratively and there's something weird going on idk i just think it's an interesting thought
I mean, I'm pretty sure Dietrich called Vincent a demon too, or something like that.
What if the guy knew vincent and not Sebastian since Sebastian made himself look a little like him maybe he mistook him for vincent no idea tho