It definitely sounds different to him; all the immortals he's known can recall the moment they became immortal. Even those who did so accidentally realized the moment they drank later.

He's not getting much new out of this guy beyond that, and he wonders if the man will be more forthcoming if Firo himself is. Time to spill, he supposes.

"Not really. I just got into some booze that turned out to be the elixir of immortality. It's a long story, but I got some off a guy I ran into."

Not so much a long story as a story that involves Firo robbing an unconscious elderly man. Let's just call it a long story.