Holy shit! Fucking savage!
I'm pretty sure that in japan-man business culture returning someones card and saying 'we don't need it' is slightly more of a fuck you than digging up their mom's grave to shit on the corpse. And he just tossed it back at him too, like saying he didn't want to touch him, damn.
earlier this chapter, I was wondering if the house was there to help them, and if not, what would happen if the owner returned, and I guess it was a coincidence i found out