 Why can't the square-built man defend Trella against the men attacking her?
Trella swung with her whole body, and slapped him so hard he nearly fell from his chair. The dark man moved in on Trella again as Kregg overtook his quarry and swung a huge fist like a sledgehammer. The dark man, who had grabbed Trella's arm, released her and ran for the door. Trella had the desk clerk call a cab to deliver the unconscious Motwick to his home. There were four crew members and three passengers aboard the ship's tiny personnel sphere, and Trella was thrown with Quest almost constantly. When it was found at last, he sent Trella, his most trusted secretary, to Ganymede to bring back to him the notebooks found there.
 His programming does not allow it
 His programming does not allow it  He is a strict pacifist  He is full of cowardice  He is secretly collaborating with Trella's attackers