It is a confusing quote. It says one thing, then new sentence asserts what Wigit is saying if taken alone. After multiple readings, my understanding is, arbitrary killing should be close to 50% males, half adult (since they're 50% under 18). That's where you get 26% expected adult males if indiscriminant. They then move to a different window and assert its 72% male there. Kind of a bad way to present data, but any window should be 50% male if random, and here it skews male, thus more likely fighters. But we don't get a clear idea of what portion of total deaths that is, and have to assume it's opportunistically chosen to make a point imo