This was when Cantrell, a high-strung individual at best, reacted violently to the change in the creature. In an instinctive blaze of anger and frustration, Cantrell reached out and slapped him brutally across the face. Velie, the agent in charge, also acted instinctively as he lunged forward to restrain Cantrell. But then he froze, as did all the men in the room, to stare. It was not what the prisoner did; it was what he did not do. There was absolutely no reaction to the blow--no reaction physically, emotionally, or mentally. It was as though the blow had not been struck; as though this were some kind of a moving, breathing zombie. So tangible, so seemingly sourceless was this feeling of loathing, that Hagen would have been sure it had affected only himself if he had not seen its effect on the others. Yet none of them referred to it. Nor was this strange, because there just weren't any words to describe the feeling one gets from contact with a pleasant-faced, quietly dressed example of the walking dead. Backing away from this powerful emotional reaction, Hagen forced himself onto an intellectual level, and asked himself what had brought about the change in the creature. Why had it--Hagen now had to regard the strange, walking enigma as neuter--after functioning to some extent as a human, reverted suddenly to what seemed to be its natural state? He conceded that if he knew the answer to that one, he could be of great service to the FBI and the nation--and, no doubt to the world ... Pender of the Army now had a question. "What information have you gotten from the surviving man?" "Not a great deal, as yet. However, in our experiments we've learned something rather frightening." "And what's that?" "He is totally impervious to drugs of any description whatever." "That's impossible!" "So it would seem. But the sodium pentathol injection he was given could just as well have been so much water." The group pondered this information, each after his own fashion. Then Birch of the State Department made a precise, scholarly observation. "Incredible!" Brent smiled faintly. "One point of vital importance. We do know that there were, originally, ten of these creatures roaming the country. Eight are accounted for. The other two are still at large." Jones of the Air Force asked, "Were all eight apprehended in large cities?" "Yes." "Shouldn't that mean something to us?" "Well, it's a pattern, all right, but no one's been able to give it any meaning--so far." No one had any further comment on that point. Brent waited a moment and then threw the bombshell. "We are quite sure that these creatures are of extraterrestrial origin."