Based on the context and the answer, generate a 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 .

Answer:

Physically tracking them .



How did the narrator find the person ?