He moved in, edging past the rolls of plastic, climbing over a low stack of plywood, and spotted, in the harsh light slung from the scavenged fluorescents closer to the pedestrian stroll, two frosty-looking white marks, something aerosoled over two darker stains, and he knew what that was. Kil'Z, this stuff you sprayed where bodily fluids had gotten out, in case the person who'd lost them was seropositive. He knew what Kil‘Z looked like over blood, and this was that.