Only when the outer door was opened onto the grassy sunlit plain did they believe him. They grunted with surprise as they left, calling out in wonder at the strange sights and the warm temperature. Mark looked around nervously, but the herd of mammoth was gone. There were more than enough other things to capture the Indians' attention. They saw animals where he saw only grass and trees and called attention to them with pleased shouts. Yet they were silent instantly when Great Hawk raised his hand for silence, then pointed.

"There, under those trees. It looks like a large pig."

Mark could see nothing in the shadows, but the other

Indians were apparently in agreement, for they were nocking arrows to their bows. When the dark, scuffling shape emerged into the sunlight, they were ready for it, A European boar, far larger than they had ever seen. The boar had never seen men before either; it was not afraid; The arrows whistled; more than one struck home, the boar wheeled about, squealing with pain, and crashed back into the undergrowth. Whooping with pleasure, the Oneida were instantly on its trail.

"Stay inside until we get back," Mark told the Sixim. "I want to be sure we can get back."

He ran swiftly after the others, who had already vanished under the trees. The trail was obvious, marked with the blood of the fleeing animal, well trampled by its pursuers. From ahead there came even louder squealing and shouts that ended in sudden silence. When Mark came up, it was all over; the boar was on its side, dead, its skull crushed in, while the victorious Indians prodded its flanks and hams happily.

The explosion shook the ground at that moment, a long, deep rumbling sound that hammered at their ears. It staggered them, it was so close and loud, frightening them because they did not know what it was. Mark did. He had heard this kind of noise before. He wheeled about and watched the large cloud of greasy black smoke roiling and spreading as it climbed up the sky. It rose from behind the trees in the direction of the building. Then he was running, slamming a cartridge in the chamber of the rifle at the same time, thumbing off the safety.

The scene was a disaster. He stumbled and almost fell as he emerged from beneath the trees.

Where the squat steel building had stood was now only a smoking, flame-licked ruin of torn and twisting plates. On the grass nearby, one leg ripped away and as torn himself, lay the Sixim.

The doorway between the worlds was closed.

7

Mark just stood there, motionless, even after the Indians came up and ranked themselves beside him, calling out in wonder at the devastation. They did not realize yet that they were exiled from their tribe and their own world. The Sixim raised its head and called out hoarsely; Mark ran to it. Much of its imitation flesh was gone, and metal shone through the gaps. Its face had suffered badly as well, but it could still talk.

"What happened?" Mark asked.

"There were strangers in the room, men with guns. This is not allowed. There are orders. I actuated the destruct mechanism and attempted to use the escape device."

Mark looked at the ruin and flames. "There is no way this room can be used again?" -

"No."

"Are there other rooms on this world?"

"One that I know of, perhaps more____________________ "

"One is enough! Where is it?"

"What is the name of your world line?"

"What difference does that make?… All right, it's called Einstein."

"The room is located on an island that is named Manhattan." '

"Of course! The original one I came through. But that must be at least two hundred miles away from here as the crow flies."

But what was two hundred miles as compared to the gap between the worlds? His boots were sound, he was a couple of pounds overweight, but otherwise in good condition. He had companions who were at home in the wilds and knew how to live off the land. If they would come with him… They had little other choice. If he could explain to them what had happened and what they must do…

It was not easy, but the existence of this world led them to believe anything he told them-if not believe it, at least not to doubt it too strongly. In the end they were almost eager to see what this new land had to offer, what other strange animals there were to hunt. While the others butchered and smoked the fresh-killed meat, Mark labored to explain to Great Hawk that they were physically at the same place in the world as the one they had left. The Indian worked hard to understand this but could not, since this was obviously a different place. Mark finally forced him to accept the fact on faith, to operate as if it were true even though he knew it wasn't.