The projector came into use again. R. Preston stared out of it; identical with R. Idda in every respect, except for some trivial chest design.
Baley said, "Greetings, R. Preston." He kept the record of R. Idda's examination before him as he spoke.
"Greetings, sir," said R. Preston. His voice was identical with that of R. Idda.
"You are the personal servant of Alfred Ban Humboldt are you not?"
"I am, sir."
"For how long, boy?"
"For twenty-two years, sir."
"And your master's reputation is valuable to you?"
"Yes, sir."
"Would you consider it of importance to protect that reputation?"
"Yes, sir."
"As important to protect his reputation as his physical life?"
"No, sir."
"As important to protect his reputation as the reputation of another?"
R. Preston hesitated. He said, "Such cases must be decided on their individual merit, sir. There is no way of establishing a general rule."
Baley said, "If you decided that the reputation of your master were more important than that of another, say, that of Gennao Sabbat, would you lie to protect your master's reputation?"
"I would, sir."
"Did you lie in your testimony concerning your master in his controversy with Dr. Sabbat?"
"No, sir."
"But if you were lying, you would deny you were lying, in order to protect that lie, wouldn't you?"
"Yes, sir."
"Well, then," said Baley, "let's consider this. Your master, Alfred Barr Humboldt, is an old man of great reputation in mathematics, but he is an old man. If, in this controversy with Dr. Sabbat, he had succumbed to temptation and had acted unethically, he would suffer a certain eclipse of reputation, but his great age and his centuries of accomplishments would stand against that and would win out. Men would look upon this plagiaristic attempt as the mistake of a perhaps-sick old man, no longer certain in judgment.
"If, on the other hand, it were Dr. Sabbat who had succumbed to temptation, the matter would be much more serious. He is a young man, with a far less secure reputation. He would ordinarily have centuries ahead of him in which he might accumulate knowledge and achieve great things. This will be closed to him, now, obscured by one mistake of his youth. He has a much longer future to lose than your master has. You see, don't you, that Sabbat faces the worse situation and deserves the greater consideration?"
There was a long pause. Then R. Preston said, with unmoved voice, "My evidence was as I-"
At that point, he broke off and said nothing more. Baley said, "Please continue, R. Preston."
There was no response. R. Daneel said, "I am afraid, friend Elijah, that R. Preston is in stasis. He is out of commission."
"Well, then," said Baley, "we have finally produced an asymmetry. From this, we can see who the guilty person is."
"In what way, friend Elijah?"
"Think it out. Suppose you were a person who had committed no crime and that your personal robot were a witness to that. There would be nothing you need do. Your robot would tell the truth and bear you out. If, however, you were a person who had committed the crime, you would have to depend on your robot to lie. That would be a somewhat riskier position, for although the robot would lie, if necessary, the greater inclination would be to tell the truth, so that the lie would be less firm than the truth would be. To prevent that, the crime-committing person would very likely have to order the robot to lie. In this way, First Law would be strengthened by Second Law; perhaps very substantially strengthened."
"That would seem reasonable," said R. Daneel. "Suppose we have one robot of each type. One robot would switch from truth, unreinforced, to the lie, and could do so after some hesitation, without serious trouble. The other robot would switch from the lie, strongly reinforced, to the truth, but could do so only at the risk of burning out various positronic-track-ways in his brain and falling into stasis."
"And since R. Preston went into stasis-"
"R. Preston's master, Dr. Humboldt, is the man guilty of plagiarism. If you transmit this to the captain and urge him to face Dr. Humboldt with the matter at once, he may force a confession. If so, I hope you will tell me immediately."
"I will certainly do so. You will excuse me, friend Elijah? I must talk to the captain privately."
"Certainly. Use the conference room. It is shielded."
Baley could do no work of any kind in R. Daneel's absence. He sat in uneasy silence. A great deal would depend on the value of his analysis, and he was acutely aware of his lack of expertise in robotics.
R. Daneel was back in half an hour-very nearly the longest half hour of Baley's life.
There was no use, of course, in trying to determine what had happened from the expression of the humanoid's impassive face. Baley tried to keep his face impassive.
"Yes, R. Daneel?" he asked.
"Precisely as you said, friend Elijah. Dr. Humboldt has confessed. He was counting, he said, on Dr. Sabbat giving way and allowing Dr. Humboldt to have this one last triumph. The crisis is over and you will find the captain grateful. He has given me permission to tell you that he admires your subtlety greatly and I believe that I, myself, will achieve favor for having suggested you."
"Good," said Baley, his knees weak and his forehead moist now that his decision had proven correct, "but Jehoshaphat, R. Daneel, don't put me on the spot like that again, will you?"
"I will try not to, friend Elijah. All will depend, of course, on the importance of a crisis, on your nearness, and on certain other factors. Meanwhile, I have a question-"