Strange. As they talk, I hear their words flow over my head like a wave dashed on a sea-stone, but the words drain off, leaving no imprint. As soon as some words invade my head, something eats and digests them and I think the words are something else entirely. The psychiatrist nods at me. "I couldn't change his basic desire. Given time, yes, a period of months, I could have. But you need him _now_. So, against all the known ethics of my profession, which say one must never lie to a patient, I've followed along in his own thought channel. I didn't dare frustrate him. He wanted to go home, so I _let_ him. I've given him a fantasy. I've set up a protective defense mechanism in his mind that refuses to believe certain realities, that evaluates all things from its own desire for security and home. His mind will automatically block any thought or image that endangers that security." The captain stares wildly. "Then, then Halloway's insane!" "Would you have him mad with fear, or able to work on Mars hindered by only a slight 'tetched' condition? Coddle him and he'll do fine. Just remember, we're landing on Earth, _not_ Mars." "Earth, Mars, you'll have _me_ raving next!" The doctor and the captain certainly talk weirdly. Who cares? Here comes Earth! Green, expanding like a moist cabbage underfoot! "Mars landing! Air-lock opened! Use bulger oxygen." Here we go, gang! Last one out is a pink chimpanzee! "Halloway, come back, you damn fool! You'll kill yourself!" Feel the good sweet Earth! Home again! Praise the Lord! Let's dance, sing off-key, laugh! Ha! Oh, boy! In the door of the house stands the captain, his face red and wrinkled, waving his fists. "Halloway, come back! Look behind you, you fool!" I whirl about and cry out, happily. Shep! Shep, old dog! He comes running to meet me, long fur shining amber in the sunshine. Barking. Shep, I haven't seen you in years. Good old pooch. Come 'ere, Shep. Let me pet you. The captain shrieks: "Don't pet it! It looks like a carnivorous Martian worm. Man, the jaws on that thing! Halloway, use your knife!" Shep snarls and shows his teeth. Shep, what's wrong? That's no way to greet me. Come on, Shep. Hey! I pull back my fingers as his swift jaws snap. Shep circles me, swiftly. You haven't rabies, have you, Shep? He darts in, snatches my ankle with strong, locking white teeth! Lord, Shep, you're crazy! I can't let this go on. And you used to be such a fine, beautiful dog. Remember all the hikes we took into the lazy corn country, by the red barns and deep wells? Shep clenches tight my ankle. I'll give him one more chance. Shep, _let go_! Where did this long knife come from in my hand, like magic? Sorry to do this, Shep, but--_there_! Shep screams, thrashing, screams again. My arm pumps up and down, my gloves are freckled with blood-flakes. Don't scream, Shep. I _said_ I was sorry, didn't I? "Get out there, you men, and bury that beast immediately."