Oh, he definitely catches that implication. It's not a hard one to miss, and he has to wonder just who Ned killed when he'd brought whoever it had been back from the dead. His raised eyebrow speaks to that question, though silently; it seems rude, somehow, to question Ned quite that intently.

"So I imagine you probably don't do that a lot. Bringing people back to live and letting them stay alive, I mean."

Unless Ned has some bizarre interest in bringing people back to life and killing off other, random people, he can't imagine why he would. If he can't control who ends up dead, it seems like a power that could easily be dangerous. Maybe that explains a bit about Ned's seeming aloneness -- Meyer imagines it would be difficult to live with something like that, controlling the power of life and death in a way that most people don't.