Culling at night does not present the level playing field that the hunter would ensure during a classical "walk-and-stalk" day time hunt. It is, however, a humane way to take out selected animals without causing too much disruption in the herd.
Day time culling is (debatably) more traumatic on the rest of the herd. Blesbuck is usually taken from a vehicle at reasonably close distances, using head shots. (We call it "diesel stalking"). Of these 11 specimens all but one qualified for Roland Ward! It is a pity that they could not be taken by serious trophy hunters.