 Why is Lane flying over Newyork at the beginning?
Raging , Trooper Lane hovered three thousand feet above Tammany Square. The cool cybrain surgically implanted in him was working on the problem. Just a little time off, so I shouldn't blow my top. The humming paragrav-paks embedded beneath his shoulder blades held him motionless above Newyork's three administrative towers. Mayor's Palace. They don't teach them about their own city, that they'll be fighting for. From seven years old up, Troopers have too much to learn about fighting. Two black paragrav-boats whirred along the translucent underside of Newyork's anti-missile force-shield, the Shell. Old cybrain better be fast. 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. Lane is an insane killer. 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. "Trooper Lane, of the Newyork Special Troops, is all." Orange or green is the action. This is an embassy, if you know what that means." "Well, you should have had brains enough to honor the flag outside this window. "I'm the guy they told you about on the 3V. Where's the Mayor? "Force-screen. Nothing gets past, except maybe a full-size blaster-beam. "I told you, I'm an ambassador. From Mars. "The planet Mars." Sure, I've heard of it—you gotta go by spaceship. He takes orders from Newyork." Gerri Kin said, "That's what the force-domes did. But also the road to the return to city-states.
 He cracked after being trapped after combat and needed to get out
 He intends to take over the city's government  His cybrain has malfunctioned and sent him to the city  He is on a mission assigned by Colonel Klett  He cracked after being trapped after combat and needed to get out