[ Thinking about the example actually completely distracts her from the original topic - seriously, she doesn't even see how it's a metaphor for the situation, yet she's thinking about it deeply. ]

I get that.. It would be really sad if something happened to that book, since if it would be ruined it would be really, really sad since there wouldn't be any other one of it left.. So you have to make sure it'll be okay no matter what.