Katie contemplated the boy for a moment, keeping quiet as she listened and then remaining silent for a few moments after he had finished speaking. Needless to say she'd come to the conclusion that he was a Quidditch player longing after some of the nicer things that the shop carried. It wasn't unusual, and Katie felt sympathy for him in that moment, but didn't want to show it. Most people tended to take that sort of thing as pity, especially when they stumbled around words that made it seem as if they were just looking because they hadn't the money to buy it. Giving a shrug, Katie gestured toward the window and asked, "Do you play?"
While she was always friendly with strangers, there was a certain kinship that Katie felt toward other Quidditch players. She could be wrong, but she didn't see why it would be a stretch to assume that this person was one. In fact, even though she already had planned on fully introducing herself (in the even that he didn't excuse himself from the conversation and leave) if he were a fellow Quidditch player, or even just a fan, it would make her all the more intent on doing so. Katie was of the mind that it rarely ever hurt to make friends, and it certainly never hurt to make Quidditch friends.