 How is Lane able to hover over the buildings?
Raging , Trooper Lane hovered three thousand feet above Tammany Square. The cool cybrain surgically implanted in him was working on the problem. The humming paragrav-paks embedded beneath his shoulder blades held him motionless above Newyork's three administrative towers. They don't teach them about their own city, that they'll be fighting for. Two black paragrav-boats whirred along the translucent underside of Newyork's anti-missile force-shield, the Shell. Lane somersaulted. Cybrain had taken charge of his motor nerves. He began to plummet down, picking up speed. A predatory excitement rippled through him as he sailed down through the air. A little red-white-and-green flag fluttered on a staff below the window. Lane dropped lightly to the floor, inside the room, in battle-crouch. "Lashing police with his vibray," said the announcer, "Lane broke through the cordon surrounding Manhattan Armory. Tammany Hall has warned that this man is extremely dangerous. Citizens are cautioned to keep clear of him. A built-in electronic brain controls his reflexes—" "At ease with that jazz," said Lane, and a sheathed finger snapped out. The two police boats were hovering above the towers. Lane's mailed hand snapped open a pouch at his belt. The force-bomb "exploded"—swelled or inflated, really, but with the speed of a blast. A section of the energy globe bellied out from above. It shaded the view from his window and re-entered the tower wall just below.
 He has anti-gravity devices implanted in his body.
 He has anti-gravity boots.  He is in a helicopter.  He has a jet pack.  He has anti-gravity devices implanted in his body.