Cercy had selected Malley, the psychiatrist, because he wasn't sure that killing the Ambassador was going to be a purely physical problem.
Darrig was a mathematical physicist, but his restless, curious mind had come up with some interesting theories in other fields. He was the only one of the four who was really interested in the Ambassador as an intellectual problem.
"He's like Metal Old Man," Darrig said finally.
"What's that?"
"Haven't you ever heard the story of Metal Old Man? Well, he was a monster covered with black metal armour. He was met by Monster-Slayer, an Apache culture hero. Monster-Slayer, after many attempts, finally killed Metal Old Man."
"How did he do it?"
"Shot him in the armpit. He didn't have any armour there."
"Fine," Cercy grinned. "Ask our Ambassador to raise his arm."
"All set!" Harrison called.
"Fine. Go."
In the Ambassador's room, an invisible spray of gamma rays silently began to flood the room with deadly radiation.
But there was no Ambassador there to receive them.
"That's enough," Cercy said after a while. "That would kill a herd of elephants."
But the Ambassador stayed invisible for five hours, until
some of the radioactivity had abated. Then he appeared again.
"I'm still waiting for that typewriter," he said.
"Here's the Analyser's report." Malley handed Cercy a sheaf of papers. "This is the final formulation, boiled down."
Cercy read it aloud: " "The simplest defence against any and all weapons is to become each particular weapon.""
"Great," Harrison said. "What does it mean?"
"It means," Darrig explained, "that when we attack the Ambassador with fire, he turns into fire. Shoot at him, and he turns into a bullet — until the menace is gone, and then he changes back again." He took the papers out of Cercy's hand and riffled through them.
"Hmmm. Wonder if there's any historical parallel? Don't suppose so." He raised his head. "Although this isn't conclusive, it seems logical enough. Any other defence would involve recognition of the weapon first, then an appraisal, then a counter-move predicated on the potentialities of the weapon. The Ambassador's defence would be a lot faster and safer. He wouldn't have to recognize the weapon. I suppose his body simply identifies, in some way, with the menace at hand."
"Did the Analyser say there was any way of breaking this defence?" Cercy asked.
"The Analyser stated definitely that there was no way, if the premise were true," Malley answered gloomily.
"We can discard that judgement," Darrig said. "The machine is limited."
"But we still haven't got any way of stopping him," Malley pointed out. "And he's still broadcasting that beam."
Cercy thought for a moment. "Call in every expert you can find. We're going to throw the book at the Ambassador. I know," he said, looking at Darrig's dubious expression, "but we have to try."
During the next few days, every combination and permutation of death was thrown at the Ambassador. He was showered with weapons, ranging from Stone Age axes to modern high-powered rifles, peppered with hand grenades, drowned in acid, suffocated in poison gas.
He kept shrugging his shoulders philosophically and continued to work on the new typewriter they had given him.
Bacteria was piped in, first the known germ diseases, then mutated species.
The diplomat didn't even sneeze.
He was showered with electricity, radiation, wooden weapons, iron weapons, copper weapons, brass weapons, uranium weapons — anything and everything, just to cover all possibilities.
He didn't suffer a scratch, but his room looked as though a bar-room brawl had been going on in it continually for fifty years.
Malley was working on an idea of his own, as was Darrig. The physicist interrupted himself long enough to remind Cercy of the Baldur myth. Baldur had been showered with every kind of weapon and remained unscathed, because everything on Earth had promised to love him. Everything except the mistletoe. When a little twig of it was shot at him, he died.
Cercy turned away impatiently, but had an order of mistletoe sent up, just in case.
It was, at least, no less effective, than the explosive shells or the bow and arrow. It did nothing except lend an oddly festive air to the battered room.
After a week of this, they moved the unprotesting Ambassador into a newer, bigger, stronger death cell. They were unable to venture into his old one because of the radioactivity and micro-organisms.
The Ambassador went back to work at his typewriter. All his previous attempts had been burned, torn or eaten away.
"Let's go talk to him," Darrig suggested after another day had passed. Cercy agreed. For the moment, they were out of ideas.
"Come right in, gentlemen," the Ambassador said so cheerfully that Cercy felt sick. "I'm sorry I can't offer you anything. Through an oversight, I haven't been given any food or water for about ten days. Not that it matters, of course."
"Glad to hear it," Cercy said. The Ambassador hardly looked as if he had been facing all the violence Earth had to offer. On the contrary, Cercy and his men looked as though they had been under bombardment.
"You've got quite a defence there," Malley said conversationally.
"Glad you like it."
"Would you mind telling us how it works?" Darrig asked innocently.
"Don't you know?"
"We think so. You become what is attacking you. Is that right?"
"Certainly," the Ambassador said. "You see, I have no secrets from you."
"Is there anything we can give you," Cercy asked, "to get you to turn off that signal?"
"A bribe?"
"Sure," Cercy said. "Anything you?—"
"Nothing," the Ambassador replied.
"Look, be reasonable," Harrison said. "You don't want to cause a war, do you? Earth is united now. We're arming—"
"With what?'"
"Atom bombs," Malley answered him. "Hydrogen bombs. We're—"
"Drop one on me," the Ambassador said. "It wouldn't kill me. What makes you think it will have any effect on my people?"
The four men were silent. Somehow, they hadn't thought of that.
"A people's ability to make war," the Ambassador stated, "is a measure of the status of their civilization. Stage one is the use of simple physical extensions. Stage two is control at the molecular level. You are on the threshold of stage three, although still far from mastery of atomic and subatomic forces." He smiled ingratiatingly. "My people are reaching the limits of stage five."
"What would that be?" Darrig asked.
"You'll find out," the Ambassador said. "But perhaps you've wondered if my powers are typical? I don't mind telling you that they're not. In order for me to do my job and nothing more, I have certain built-in restrictions, making me capable only of passive action."
"Why?" Darrig asked.
"For obvious reasons. If I were to take positive action in a moment of anger, I might destroy your entire planet."
"Do you expect us to believe that?" Cercy asked.
"Why not? Is it so hard to understand? Can't you believe that there are forces you know nothing about? And there is another reason for my passiveness. Certainly by this time you've deduced it?"
"To break our spirit, I suppose," Cercy said.
"Exactly. My telling you won't make any difference, either. The pattern is always the same. An ambassador lands and delivers his message to a high-spirited, wild young race like yours. There is frenzied resistance against him, spasmodic attempts to kill him. After all these fail, the people are usually quite crestfallen. When the colonization team arrives, their indoctrination goes along just that much faster." He paused, then said, "Most planets are more interested in the philosophy I have to offer. I assure you it will make the transition far easier."