"Maybe. One sec." He makes a black stick-shaped device, and without appearing to manipulate it in any way, sets it up to reflect the immediate surroundings. "Marker," he says to it. "Recording a test of offering this vampire here half a cup of blood designed to be from the hypothetical offspring of, oh, let's say C.S. Lewis and Joan of Arc, I think I can be tolerably sure they have never actually reproduced." He looks at Isabella. "How do you take it? Teacup? Straw? Aerosol?"