Explain how Saki makes the surprise ending of "The Interlopers" seem logical.

Georg's and Ulrich's family have been fighting over a piece of land for generations. Ulrich's grandfather wins the land in a lawsuit, but Georg's family continued to poach upon it, regardless of the determination of the court. In a sense, both men have continuously attempted to own and tame the land. This land is in the forest. It is wild. These men have attempted to own, cultivate, and rule over this piece of wild land. They have attempted to regulate the land with their civilized laws and notions of "owning land." But this is nature. It seems illogical to impose a law on something that is inherently wild. So, the "civilized" Georg and Ulrich are the interlopers. They are trying to impose their way of life onto nature itself. 
They've spent their lives fighting each other, each thinking that his opponent is the interloper. But nature (the wolves) show that both men have been interloping on their (wolves') land. So, it is morbid but logical that the true interlopers are exposed in the end. This is a classic story of the hunters becoming the hunted.