Studying quietly at your local library, you hum to yourself while sitting down at a table and reading.

Your bodyguard's nearby, poised and at the ready. You figure he could use a break, so you beckon him over and he obliges immediately.

"What's wrong?" he asks, initially worried. He relaxes when you show him the books in your hand. You start explaining how you read books and how braille works.

"So, different arrangements in domino-like patterns are letters?" he asks, paying close attention.