Her headlamp sliced images out of the dark as she walked. Cows rising grumpily from the dirt. Cows chewing feed piled along fences. Cows defecating as they sauntered from one side of a corral to another, their swollen udders bulging several inches behind their haunches. She nudged most of them along just by clapping her hands, shushing loudly or flapping her arms like a duck.