Ford nods, committing the pattern to memory. He'll find somewhere suitable to put it. Somewhere less obvious than the lining of his coat, since this is a last-resort kind of deal rather than the first line of defense. Inside the clothes, maybe inside a pocket or on a sock.

"Let's see. There's the magic nullification runes, the blood-to-ammonia spell, the blood-to-hydrogen glyph, and an unlocking spell," Ford rattles off, counting them on his fingers. "Is there anything else I should know that will help me stop your enemies from killing me to get to you?"