He hadn't. When Allen whipped his head around to look at him, there was barely time to brake the heavier double to avoid a shrewdly planned collision. Halgersen, Nedda had said. He was thick-set, with heavy brows and large jaw. The type Allen had learned to associate with power and endurance but not too much speed.

Halgersen was holding a knife in his right hand. Allen quickly slipped his own blade from the sheath conveniently held at the front of his belt. They cut intricate patterns of feint, attack and withdraw, using passing vehicles as buffers. But not for long.

A voice from the crowd called, "Fight!" and space grew miraculously about the combatants, leaving a huge clearing in the street rimmed solidly with scooters and pedestrians. A few shouts of encouragement began to be heard as individuals selected one or the other of the men as a likely winner.

Allen dodged a sudden attempt at a side-swipe collision and the attendant vicious swipe of Halgersen's blade—and then drew first blood by a lightning riposte to the arm. Legal knife target was arm, leg, abdomen and a forehead cut without thrust—which would obscure vision with blood without doing organic damage.

The bright yellow luminescence of a police copter dropped and hovered as Allen tried to follow up his momentary advantage. The scene, he knew, would now be simultaneously filmed for possible legal record and broadcast on all teleview news programs. Entertainment for adults, education for the teeners.

A feminine voice in the front ranks called, "Two stunts to one on green jacket!" and was immediately taken up by another girl near by.

He had little time to think with satisfaction that no female had ever been forced to pay off a bet of some ingeniously embarrassing public behavior on his account. Halgersen was now trying to maneuver him for a straight ram which would bring them definitely together. He wasn't being weakened by the slow drip of blood from his arm and he didn't seem to be bothered by pain.

And then they were close to the circle rim. Allen swung his scooter so the cooling downdraft from the copter—coming from above the center of the cleared area—was directly against his back, a method he had devised for knowing his position without having to take his eyes from a close opponent. He let his shoulders droop suddenly, as though he was tired, and at the murmur of disappointment from many onlookers he began to back slowly away from Halgersen.

The blue-jacketed figure rolled into the trap scowling. He tried again for a head-on ram. Allen let him come, and at the last possible instant, when Halgersen would be unable to reverse, stop, or even swerve, he flipped the bar to full power ahead. And braced himself accordingly.

The scooters met with a bone-jarring thud of perimeter rubber. Halgersen was hurled neatly over his own guard rail to land gaspingly across Allen's.