boundary of the bubble cross-sectioned the intruding figure. Then they recognized the back of another long-haired warrior and realized that the audience on the other side of the bubble had probably seen him approaching for some time.

He bowed to the hooded figure and handed him a small bag.

"More atavistic cubs, big and little! Hold still, Cynthia," a new voice cut in.

Hal turned and saw that two cold-eyed girls had been ushered into the cubicle. One was wiping her close-cropped hair with one hand while mopping a green stain from her friend's back with the other.

Hal nudged Joggy and whispered: "Butch!"

But Joggy was still hypnotized by the Time Bubble.

"Then how is it, Hal," he asked, "that light comes out of the bubble, if the people don't? What I mean is, if one of the people walks toward us, he shrinks to a red blot and disappears. Why doesn't the light coming our way disappear, too?"

"Well—you see, Joggy, it isn't real light. It's—"

Once more the interpreter helped him out.

"The light that comes from the bubble is an isotope. Like atoms of one element, photons of a single frequency also have isotopes. It's more than a matter of polarization. One of these isotopes of light tends to leak futureward through holes in space-time. Most of the light goes down the vistas visible to the other side of the audience. But one isotope is diverted through the walls of the bubble into the Time Theater. Perhaps, because of the intense darkness of the theater, you haven't realized how dimly lit the scene is. That's because we're getting only a single isotope of the original light. Incidentally, no isotopes have been discovered that leak pastward, though attempts are being made to synthesize them."

"Oh, explanations!" murmured one of the newly arrived girls. "The cubs are always angling for them. Apple-polishers!"

"I like this show," a familiar voice announced serenely. "They cut anybody yet with those choppers?"

Hal looked down beside him. "Butch! How did you manage to get in?"

"I don't see any blood. Where's the bodies?"

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