Glowing eyes in Cowlitz County, Washington

I was elk hunting this past week in the Mt. Adams and Mt Saint Helens areas. I headed up on a hike on Wed. the 23rd of September at a place called Spencer Butte. It's located Outside of Cougar and is a steep hike of 1800 elevation gain (it sits about 4300 ft). My friends and I headed up the hill in the morning at about 8:30 am. The weather was very rainy. We were trying to be very observant of any sounds or tracks. About half way up the mountain my friend turns to me and says 'did you hear that? it sounds like people yelling' I listened for a moment and heard what I would describe as a distant yowl...far up the trail. It was faint but distinct. We continued up the trail and eventually reached the top. My guess is it was about 10 am. Once we had reached the geological marker at the top, my friend and I began a search splitting directions. I continued through the trees and brush for about 75 yards from the geological marker and came to a clearing. I sat for a few moments and noticed that beyond the clearing...roughly another 35 yards or so was an alder that was shaking. I could just see the top of it, but there wasn't wind at the time and it was shaking intermittently. It happened several times. I thought I had an animal...possibly an elk pushing against the tree. I approached it and paused as I could hear something begin to move away. I then backtracked...grabbed my friend and he followed me over to the area. We proceeded to move around the area on either side hoping to see what it was. It was gone...Once I got to the tree I was surprised by how big the trunk was. Something big must of moved it. We split up again and I went back the way I came. As I was walking I came across a bit of mud and gravel. I noticed something very distinct. A Print. It was a left foot. I could see all of the toe outlines and it was much much bigger than my foot. I took a picture with my phone. We didn't have any other incidents but that sound, tree shaking and print are very compelling evidence. The location was also very compelling. The print was well away from the initial trail and geological marker. I have always been a believer, My grandfather researched and searched for bigfoot and before he died gave me his plaster cast from California. On another note, A few months ago had a very strange early morning (2:30 am) whistling experience, with eye shine earlier, movement and a dog that was very wary (but fearful) of something in the back woods near my house. I live in the Jim Creek area in Arlington, Wa. I can share more on that at a later date if interested.