What is the surprise ending in "The Interlopers" and are it and the title appropriate?

The surprise ending is that wolves reach Ulrich and Georg at the end of the story.

Wolves reaching the two men at the end of the story is appropriate. Ulrich and Georg have been the enemy of one another throughout the story. It's ironic and slightly amusing that each man should share the same fate that they would have wished upon the other. 

The title is appropriate because each man feels that the other is an interloper on their land. The title also referes to the wolves as interlopers in the conflict between Ulrich and Georg.