[Leonardo raises his hand, holding it out in front of Near. He creates a piece of chalk, which he drops into Near's hand once the other reaches out for it. Then he creates a second piece of chalk, and kneels down by the grate.]

Copy the symbols as I make them, exactly.

[He makes two signs on the ground beside the mock-up drain: one very complicated one, and a much simpler one.]

These are both representations of what is called the Elder Sign. The Simple Form and the Broad Form. It also has a Gestural Form.

[Which he will demonstrate.]

These will prevent any harm to you or those you guard, whether drawn or gestured, as long as it stays completely intact.