Threatening bellows directed at hikers and their dogs in the Holy Cross Wilderness witnessed in Eagle County, Colorado

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My girlfriend and I were hiking the Lake Charles Trail in the Holy Cross Wilderness area. We had hiked approximately 3 hrs/6 miles when we reached a basin which included 2-3 small lakes. Upon reaching the basin area (a clearing) after climbing a steep switchback, we immediately heard what sounded like a loud scream coming from approximately 50-75 yards away in a dense pine cluster at the base of a mountain. The sound grew louder as the animal was moving in a diagonal to us through the pine cluster somewhat towards us. The vocalization now sounded like a large man wailing or moaning in a loud, rhythmic pattern. The vocalization would last for 2-3 seconds then pause for 4-5 seconds then start up again. This went on for 2-3 minutes. I am an avid hiker and outdoorsman and am familiar with animal vocalizations including bear, elk, coyote, and mountain lion. I can say that what we heard was not an ordinary animal. I had with me two dobermans that have a tendency to chase a moving animal howe...