Bart broke away and ran. He was afraid, if he didn't, he'd break up again. He closed the cabin door behind him, trying to calm down so that the Mentorian steward, coming to strap him in for deceleration, wouldn't see how upset he was. He was going to need all his nerve. * * * * * He went through another decontamination chamber, and finally moved, with a line of passengers, out of the yawning airlock, under the strange sun, into the strange world. At first sight it was a disappointment. It was a Lhari spaceport that lay before him, to all appearances identical with the one on Earth: sloping glass ramps, tall colorless pylons, a skyscraper terminus crowded with men of all planets. But the sun overhead was brilliant and clear gold, the shadows sharp and violet on the spaceport floor. Behind the confines of the spaceport he could see the ridges of tall hills and unfamiliarly colored trees. He longed to explore them, but he got a grip on his imagination, surrendering his ticket stub and false papers to the Lhari and Mentorian interpreter who guarded the ramp. The Lhari said to the Mentorian, in the Lhari language, "Keep him for questioning but don't tell him why." Bart felt a cold chill icing his spine. _This was it._ The Mentorian said briefly, "We wish to check on the proper antibody component for Aldebaran natives. There will be a delay of about thirty minutes. Will you kindly wait in this room here?" The room was comfortable, furnished with chairs and a vision-screen with some colorful story moving on it, small bright figures in capes, curious beasts racing across an unusual veldt; but Bart paced the floor restlessly. There were two doors in the room. Through one of them, he had been admitted; he could see, through the glass door, the silhouette of the Mentorian outside. The other door was opaque, and marked in large letters: DANGER HUMANS MUST NOT PASS WITHOUT SPECIAL LENSES TYPE X. ORDINARY SPACE LENSES WILL NOT SUFFICE DANGER! LHARI OPENING! ADJUST X LENSES BEFORE OPENING! Bart read the sign again. Well, _that_ was no way out, for sure! He had heard that the Lhari sun was almost 500 times as bright as Earth's. The Mentorians alone, among humans, could endure Lhari lights--he supposed the warning was for ordinary spaceport workers. A sudden, rather desperate plan occurred to Bart. He didn't know how much light he _could_ tolerate--he'd never been on Mentor--but he _had_ inherited some of his mother's tolerance for light. And blindness would be better than being burned down with an energon-gun! He went hesitantly toward the door, and pushed it open.