The word interlopers is what probably has three meanings. The word itself means intruders, so let's look at three kinds of interlopers in this short story. First, one of the men was an interloperon the land--it belonged to one of them, and so at least one of them was trespassing. Second, How about the idea that the men were not where they should have been on that stormy night. It says even the night animals were running for shelter in the storm; none of them were out in it. Finally, of course, the wolves are interlopers in this new pact of friendship. They just don't belong.