"Poacher's knot. Real easy." He searches for a stick, and finding one, bends it over the little furrow like an awning. Then, taking a length of string out of his pocket, he slowly makes a knot that, to the canny eye, is essentially identical to a noose. The only difference, in fact, is that it's a noose small enough for rabbits.

He ties it and unties it, then hands the string to Duv. "Your turn, professor."