Granger, in turn, had his Patronus, a smooth snake, on her ankle. If he tapped his foot and recited the same incantation, the little snake would coil reassuringly around her ankle. It was a harmless, pointless charm, and yet it had become their routine to use it on the eve of a battle. A small, seemingly irrelevant gesture, but somehow intimate and sacred. Perhaps it was because Granger was the only one who had ever seen it. She had, of course, been its catalyst.