The textual evidence from “The Interlopers” that supports the conclusion that hatred feeds on itself is "The feud might, perhaps, have died down or been compromised if the personal ill-will of the two men had not stood in the way; as boys they had thirsted for one another's blood, as men each prayed that misfortune might fall on the other…"
Explanation:
The conclusion that hatred feed in itself has supporting details in this excerpt since it has several keywords that show how the characters hate grows trough itself, for example, "The feud might, perhaps, have died down" says that there was a chance to stop it, only if the two men had stopped hating each other, but they didn't do it so it kept on growing, and at the end the line "as men each prayed that misfortune might fall on the other" is another supporting detail where we see that hate attracts more hate.
Textual evidence from “The Interlopers” that supports the conclusion that hatred feeds on itself is:
3. "The feud might, perhaps, have died down or been compromised if the personal ill-will of the two men had not stood in the way; as boys, they had thirsted for one another's blood, as men each prayed that misfortune might fall on the other…"
Saki explains the hatred between the Ulrich and the George in the story. As the result of lightning that struck the huge beech tree, both are trapped under the branch of the tree where they are unable to touch each other but can speak. in such heedless situation, Ulrich offers the flask to George, to which he refuses stating he doesn't drink with his enemies. Later Ulrich proposes the treaty of peace and to end this feud. George thinks upon this treaty and accepts the proposal later realizing this feud to be a foolish act. Action falls when they both scream out of help and they see something or someone approaching down the hill. As a result, as they screamed for help, their death arrived down the hill, Wolves.