Branch breaks and close vocalization heard while cutting pole trees mid day, near Tumalo witnessed in Deschutes County, Oregon

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I lived in Tumalo Oregon in 1982 and made a deal with my landlord to pay off some rent by providing him with long fence poles to line his nearby property with. I worked nearby on a horse ranch and rode extensively into the Deschutes National Forest on extended rides to the end of old logging roads into small valleys, toward the Three Sisters Mountains. Once I remember my bounding cow dog running from my front and staying behind my horse. A few minutes later the horse was alerted to something in the distance and refused to go any further. It was in this direction I drove the Chevy truck toward where I could cut down some long, straight narrow poles to pay off my rent. I drove up a narrow road that ended with a loop around a big Douglas fir. The valley was steep to both sides with steady elevation increases to the west toward the Cascade Mountains. I had a hand tree saw and an ax, and I started to cut down, clean up, and drag several pole trees toward the road/truck. About 15-20...