The swatch of fallen hail was only a few dozen meters across. After half a minute the twister had cleared it. But wading knee-deep through the chilly air had visibly upset it. Its violent spew of filth at ground level dropped off drastically. Then it shivered top to bottom. The dry bands of filth around its midsection thinned and dimmed out. As the air grew clearer a pair of dense dirty runnels suddenly appeared within the spike, for all the world like a pair of stumbling, whirling legs.