Read the following context and answer the question.
Context: I continued to hear it running . I followed the footprints left in the freshly fallen snow . My soldier had pushed the snowblower around into the back yard and down the full length of the yard to the back corner of the fence . There he had lifted the sizable machine over the top of the fence and onto the wetland behind it .
Question: How did the narrator find the person ?
Answer:


Physically tracking them .