The guy was shrewder than he looked. I realized I had given too much credence to the scrawny body and the obvious age, and had underestimated him. Watching him set up what would be our makeshift classroom, I wondered whether there would be some value to that. Getting people to underestimate you. Not letting them see what was under the hood. Preventing them from seeing it coming. I thought of the Japanese expression No aru taka wa, tsume o kakusu. The hawk with talent hides its talons. It had always been just that for me, an expression. But for the first time, I felt an inkling of what it might really imply.