‘Hold it!’ he shouted again, and this time brandished a short squat black rod with lights on it. The lights winked briefly, the ramp paused in its ascent, and then in obedience to the signals from the Thumb (which half the electronic engineers in the galaxy are constantly trying to find fresh ways of jamming, while the other half are constantly trying to find fresh ways of jamming the jamming signals), slowly ground its way downwards again.
