action;
It not only had a blood supply, but a steady vampire population to go along with it. Nikola had befriended one of them—as much as he were capable of befriending anyone, that is—and had gotten away with obtaining blood without needing to make an appearance at the afore mentioned bar by having Rose bring it to him. He likely wouldn't supply Helen with this trivial little detail unless pressed to give it up.
"Yes, though I am flattered you consider a handful of weeks a while. Miss me that much?"