"Calculators." The tight plastic of the black man's jacket creaking as he bends to pick up one of the grenades. Turning to hand it to her. And then she is holding it: heavy, dense, knurled for gripping. Tabs or flanges that look as though meant to move in these slots. Small round windows showing white numbers. At the top something that looks like the crank on a pepper mill, as executed by a small-arms manufacturer.