What ways does the man show his expertize as a back woodsman and trecker?

The man walks through the thick snow, his unprotected cheekbones and nose feeling numb. A husky wolf-dog follows him, instinctively depressed by and apprehensive of the cold. Every warm breath the man exhales increases the ice deposit on his beard. He passes over more terrain to the frozen bed of a stream, ten miles from his destination, where he plans to eat lunch. The faintness of the last sled-trail in the snow indicates no one has been by in a month.

Though the man does not spend much time thinking, he is observant of the curves and the possibility of dangerous springs in the creek as he wends along it. If he crashed through one, he could potentially get wet up to his waist, and even wet feet on such a cold day would be extremely dangerous. As he continues, he avoids several springs. At one point, suspecting a spring, he pushes the reluctant dog forward to investigate.