The sudden change in Ruby's demeanor is startling, but understandable, in its own way. That doesn't make Hermione feel any less guilty, though, and she reaches out a hand, though she doesn't expressly try to touch her.

"Ruby, wait," she says softly. "I'm sorry, I didn't mean to cross a line. We don't have to talk about anything you don't want to. I was just trying to understand what makes your condition different from the lycanthropy I'm more familiar with. Please don't be upset."