gabe , who had plenty of extra time , rode on his imaginary shining bright rainbow unicorn silver-and-blue charger stallion with a curlicue horn and a loaded eight-cylinder engine , to her rescue , encouraging her , helping her to edit and tighten up some of the feebler points of her great amerafrican novel ( gam for short , silken-smooth and showing only millimeters below the calf ) , and nimbly adding some of his own plot devices in select spine-chilling sequences .