 Why is Trella being attacked?
He was a living weapon of destruction— immeasurably powerful, utterly invulnerable. Trella feared she was in for trouble even before Motwick's head dropped forward on his arms in a drunken stupor. Trella had not wanted to come to the Golden Satellite. It was a squalid saloon in the rougher section of Jupiter's View, the terrestrial dome-colony on Ganymede. A woman could not possibly make her way through these streets alone to the better section of town, especially one clad in a silvery evening dress. Perhaps she could call one of Motwick's friends; she had no one on Ganymede she could call a real friend herself. Trella swung with her whole body, and slapped him so hard he nearly fell from his chair. Her protector was obviously unwilling, but the dark man, faced with his massiveness, took no chances. The dark man moved in on Trella again as Kregg overtook his quarry and swung a huge fist like a sledgehammer. Exactly what happened, Trella wasn't sure. The dark man, who had grabbed Trella's arm, released her and ran for the door. Trella ran to the unconscious Motwick's side. He followed Trella out the door of the Golden Satellite and fell in step beside her. The transparent dome of Jupiter's View was faintly visible in the reflected night lights of the colonial city, but the lights were overwhelmed by the giant, vari-colored disc of Jupiter itself, riding high in the sky.
 The author does not give a clear reason for the attackers' motivations
 The author does not give a clear reason for the attackers' motivations  The attackers wish to steal Trella's documents  The attackers wish to violate Trella  The attackers are sent from Dr. Blessing to test Trella's loyalty