He shows her the note. He's decided that she can tell better than he can whether the "don't bring your bow" line is one to obey. "Not sure. I'm guessing it's about the math, but he doesn't say for sure. He could be planning a surprise party for all I know."

He pauses, adding, "if it's your birthday or something, and he is, and I just ruined it, I am so sorry."