The Word for World is Forest by Ursula K. Le Guin

not much would come as a shock to him. But a Cetian and a Hainishman, how much would they know about Terran colonies, unless chance brought them to one on the way to somewhere else? Lepennon and Or had not intended to come on-planet here at all. Or possibly they had not been intended to come on-planet, but, hearing of trouble, had insisted. Why had the commander brought them down: his will, or theirs? Whoever they were, they had about them a hint of authority, a whiff of the dry, intoxicating odor of power. Lyubov’s headache had gone, he felt alert and excited, his face was rather hot. “Captain Davidson,” he said, “I have a couple of questions concerning your confrontation with the four natives day before yesterday. You’re certain that one of them was Sam, or Selver Thele?”
    “I believe so.”
    “You’re aware that he has a personal grudge against you.”
    “I don’t know.”
    “You don’t? Since his wife died in your quarters immediately subsequent to sexual intercourse with you, he holds you responsible for her death; you didn’t know that? He attacked you once before, here in Centralville; you had forgotten that? Well, the point is, that Selver’s personal hatred for Captain Davidson may serve as a partial explanation or motivation for this unprecedented assault. The Athsheans aren’t incapable of personal violence, that’s never been asserted in any of my studies of them. Adolescents who haven’t mastered controlled dreaming or competitive singing do a lot of wrestling and fist-fighting, not all of it good-tempered. But Selver is an adult and an adept; and his first, personal attack on Captain Davidson, which I happened to witness part of, was pretty certainly an attempt to kill. As was the Captain’s retaliation, incidentally. At the time, I thought that attack an isolated psychotic incident, resulting from grief and stress, not likely to be repeated. I was wrong.—Captain, when the four Athsheans jumped you from ambush, as you describe in your report, did you end up prone on the ground?”
    “Yes.”
    “In what position?”
    Davidson’s calm face tensed and stiffened, and Lyubov felt a pang of compunction. He wanted to corner Davidsonin his lies, to force him into speaking truth once, but not to humiliate him before others. Accusations of rape and murder supported Davidson’s image of himself as the totally virile man, but now that image was endangered: Lyubov had called up a picture of him, the soldier, the fighter, the cool tough man, being knocked down by enemies the size of six-year-olds. . . . What did it cost Davidson, then, to recall that moment when he had lain looking up at the little green men, for once, not down at them?
    “I was on my back.”
    “Was your head thrown back, or turned aside?”
    “I don’t know.”
    “I’m trying to establish a fact here, Captain, one that might help explain why Selver didn’t kill you, although he had a grudge against you and had helped kill two hundred men a few hours earlier. I wondered if you might by chance have been in one of the positions which, when assumed by an Athshean, prevent his opponent from further physical aggression.”
    “I don’t know.”
    Lyubov glanced round the conference table; all the faces showed curiosity and some tension. “These aggression-halting gestures and positions may have some innate basis, may rise from a surviving trigger-response, but they are socially developed and expanded, and ofcourse learned. The strongest and completest of them is a prone position, on the back, eyes shut, head turned so the throat is fully exposed. I think an Athshean of the local cultures might find it impossible to hurt an enemy who took that position. He would have to do something else to release his anger or aggressive drive. When they had all got you down, Captain, did Selver by any chance sing?”
    “Did he what?”
    “Sing.”
    “I don’t know.”
    Block. No go. Lyubov was about to shrug and give it up when the