There are many literary devices in the story.
First, there is personification. For instance, nature has a life of its own, and she is powerful. In fact, it is nature that pins them down underneath a tree where they have to face each other for a protracted period of time. Here is what the text says:
And before the moment of hesitation had given way to action, a deed of Nature’s own violence overwhelmed them both.
There is another personification of nature. The wind screeches as both men lay on the ground. Here is the text:
Ulrich was silent for a few minutes and lay listening to the weary screeching of the wind.
In terms of foreshadowing, there is a storm. This is usually a sign that something ominous will take place. It does, as the storm fells a tree, which pins both men down.
There is also the use of irony. The Ulrich does not think he will meet Georg, but as he move around a tree, he is right there. The greater irony is that while both men are trying to survive under a tree, they actually reconcile; now they seek to outdo one another in generosity and kindness. The final twist of irony is that the story ends with wolves coming. One would think that something good would happen after their reconciliation, but it is just the opposite.