The girl gave a small, shrill cry of panic, and fled across the center of the ring.
Again the roller spun; lanced after her.
The girl threw herself aside barely in time. The roller missed her by scant inches. Racing on, once more it struck the ring-wall, even harder than before ... caromed off like a huge ball bouncing ... hurtled back, straight at the girl.
She stumbled to the left, seeking desperately to dodge it.
The roller veered.
The girl screamed; twisted.
But not quite far enough, nor fast enough. One side of the speeding roller ticked her; knocked her backward. She sprawled in a heap on the ring's floor.