 Lew's memories are intermingling with Thigs, making him feel what?
He had blasted across trackless space to subdue a defenseless world—only to meet on Earth emotions that were more deadly than weapons. Thig carefully smoothed the dark sand and seaweed of the lonely beach over the metal lid of the flexible ringed tunnel that linked the grubby ship from another planet with the upper air. Oddest of all, he wore no garments, other than the necessary belt and straps to support his rod-like weapon of white metal and his pouches for food and specimens. Here he patiently sat down to wait for an Earthman or an Earthwoman to pass. His task now was to bring a native, intact if possible, back to the carefully buried space cruiser where his two fellows and himself would drain the creature's mentality of all its knowledge. In this way they could learn whether a planet was suited for colonization by later swarms of Orthans. Already they had charted over a hundred celestial bodies but of them all only three had proven worthy of consideration. Feebly he had punched a key two days ago and a $ sign had appeared. Then he had no time for further speech, the massive arms of the stranger had wound around him and two hamlike hands shut off his speech and his wind. "With a psychic relay we will transfer the Earthman's memories and meager store of knowledge to the brain of Thig! So it was that the bodies of the Earthman and the Orthan were strapped on two parallel tables of chill metal and the twin helmets, linked to one another by the intricacies of the psychic relay, put upon their heads. For ten hours or more the droning hum of the relay sucked Terry's brain dry of knowledge. Twice, with subtle drugs they restored pseudo-life to his body and kept the electrical impulses throbbing from his tortured brain, but after the third suspension of life Thig removed his helmet. An hour later, his scars and altered cartilage already healed and painless, Thig again scraped sand over the entrance to the space ship and set out along the moonlit beach toward the nearest path running inland to his home. Memory was laying the country bare about him, Terry's own childhood memories of this particular section of Long Island. An odd sensation, that his acquired memories labeled as pleasure, sent a warm glow upward from around his heart. Men had no mates on Ortha, sex had been overthrown with all the other primitive impulses of barbarism; so he was incapable of understanding the emotions that swept through his acquired memory.
 Discontent with his regular life as he becomes more enamored with Earth life.
 Worry. He begins to worry that he won't be able to separate from Lew properly later on.  Discontent with his regular life as he becomes more enamored with Earth life.  Anger at that state of Orthan civilization.  Worry. He worries that the Hord will no longer accept him when he returns.