His left arm blocked my blow and his right fell atop it. The black glove descended upon his left shoulder.

I twisted my hand free of the charge, and he transferred his grip to my upper arm and jerked me forward. The charge went off and his left arm came loose and rolled on the floor. The side plate beneath it had buckled a little, and that was all ...

His right hand left my biceps and caught me by the throat. As two of his digits tightened upon my carotids, I choked out, You're making a bad mistake, to get in a final few words, and then he switched me off.

A throb at a time, the world came back. I was seated in the big chair the Senator had occupied earlier, my eyes focused on nothing in particular. A persistent buzzing filled my ears. My scalp tingled. Something was blinking on my brow.

=Yes, you live and you wear the helmet. If you attempt to use it against me, I shall remove it. I am standing directly behind you. My hand is on the helmet's rim.

=I understand. What is it that you want?

=Very little, actually. But I can see that I must tell you some things before you will believe this.

=You see correctly.

=Then I will begin by telling you that the four men outside are basically undamaged. That is to say, none of their bones have been broken, none of their organs ruptured. I have secured them, however, for obvious reasons.

=That was very considerate of you.

=I have no desire to harm anyone. I came here only to see Jesse Brockden.

=The same way you saw David Fentris.

=I arrived in Memphis too late to see David Fentris. He was dead when I reached him.

=Who killed him?

=The man Leila sent to bring her the helmet. He was one of her patients.

The incident returned to me and fell into place with a smooth, quick, single click. The startled, familiar face at the airport as I was leaving Memphis. I realized where he had passed, noteless, before: he had been one of the three men in for a therapy session at Leila's that morning, seen by me in the lobby as they departed. The man I had passed in Memphis was the nearer of the two who stood waiting while the third came over to tell me that it was all right to go on up.

=Why? Why did she do it!

=I know only that she had spoken with David at some earlier time, that she had construed his words of coming retribution and his mention of the control helmet he was constructing as indicating that his intentions were to become the agent of that retribution, with myself as the proximate cause. I do not know what words were really spoken. I only know her feelings concerning them, as I saw them in her mind. I have been long in learning that there is often a great difference between what is meant, what is said, what is done, and that which is believed to have been intended or stated and that which actually occurred. She sent her patient after the helmet and he brought it to her. He returned in an agitated state of mind, fearful of apprehension and further confinement. They quarreled. My approach then activated the helmet, and he dropped it and attacked her. I know that his first blow killed her, for I was in her mind when it happened. I continued to approach the building, intending to go to her. There was some traffic, however, and I was delayed en route in seeking to avoid detection. In the meantime, you entered and utilized the helmet. I fled immediately.

=I was so close! If I had not stopped on the fifth floor with my fake survey questions ...

=I see. But you had to. You would not simply have broken in when an easier means of entry was available. You cannot blame yourself for that reason. Had you come an hour later, or a day, you would doubtless feel differently, and she would still be as dead.

But another thought had risen to plague me as well. Was it possible that the man's sighting me in Memphis had been the cause of his agitation? Had his apparent recognition by Leila's mysterious caller upset him? Could a glimpse of my face amid the manswarm have served to lay that final scene?

=Stop! I could as easily feel that guilt for having activated the helmet in the presence of a dangerous man near to the breaking point. Neither of us is responsible for things our presence or absence cause to occur in others, especially when we are ignorant of the effects. It was years before I learned to appreciate this fact, and I have no intention of abandoning it. How far back do you wish to go in seeking causes? In sending the man for the helmet as she did, it was she herself who instituted the chain of events which led to her destruction. Yet she acted out of fear, utilizing the readiest weapon in what she thought to be her own defense. Yet whence this fear? Its roots lay in guilt, over a thing which had happened long ago. And that act also, Enough! Guilt has driven and damned the race of man since the days of its earliest rationality. I am convinced that it rides with all of us to our graves. I am a product of guilt, I see that you know that. Its product; its subject; once its slave ... But I have come to terms with it: realising at last that it is a necessary adjunct of my own measure of humanity. I see your assessment of the deaths, that guard's, Dave's, Leila's, and I see your conclusions on many other things as well: what a stupid, perverse, short-sighted, selfish race we are. While in many ways this is true, it is but another part of the thing the guilt represents. Without guilt, man would be no better than the other inhabitants of this planet, excepting certain cetaceans, of which you have just at this moment made me aware. Look to instinct for a true assessment of the ferocity of life, for a view of the natural world before man came upon it. For instinct in its purest form, seek out the insects. There, you will see a state of warfare which has existed for millions of years with never a truce. Man, despite enormous shortcomings, is nevertheless possessed of a greater number of kindly impulses than all the other beings, where instincts are the larger part of life. These impulses, I believe, are owed directly to this capacity for guilt. It is involved in both the worst and the best of man.

=And you see it as helping us to sometimes choose a nobler course of action!

=Yes, I do.

=Then I take it you feel you are possessed of a free will?

=Yes. I chuckled.

=Marvin Minsky once said that when intelligent machines were constructed, they would be just as stubborn and fallible as men on these questions.

=Nor was he incorrect. What I have given you on these matters is only my opinion. I choose to act as if it were the case. Who can say that he knows for certain?

=Apologies. What now? Why have you come back?

=I came to say good-bye to my parents. I hoped to remove any guilt they might still feel toward me concerning the days of my childhood. I wanted to show them I had recovered. I wanted to see them again.

=Where are you going?

=To the stars. While I bear the image of humanity within me, I also know that I am unique. Perhaps what I desire is akin to what an organic man refers to when he speaks of finding himself. Now that I am in full possession of my being, I wish to exercise it. In my case, it means realization of the potentialities of my design. I want to walk on other worlds. I want to hang myself out there in the sky and tell you what I see.

=I've a feeling many people would be happy to help arrange for that.

=And I want you to build a vocal mechanism I have designed for myself. You, personally. And I want you to install it.

=Why me?

=I have known only a few persons in this fashion. With you I see something in common, in the ways we dwell apart.

=I will be glad to.

=If I could talk as you do, I would not need to take the helmet to him, in order to speak with my father. Will you precede me and explain things, so that he will not be afraid when I come in?