"Okay, great, I'll just.. owl you then, sometime. See you, Tristan," and with that Lyra, grinning like a fool (or a maniac as her sisters might've said) turned on her heel and took off down the aisle, book still in hand.
Later, Madame Pince would ask why on earth Lyra bought a copy of Thumbelina and what purpose it might serve in her personal library when it was a child's tale?
She didn't mean to buy it but there it was, bought none the less as she had been thinking about the man she just met instead of the book she was absently purchasing.