Report 59343: Father and son experience "disappearing stump" on Carmen Creek Road while scouting for deer during the day outside the city of Salmon

During an evening hunting trip the two of us were driving up a fairly rough patch of road looking for deer sign, it was the last day of the season and was pretty late, around 4 pm or so.  The weather was a little foggy with a light rain. I had stopped the truck to look up a small ridge about 300 or so yards away.  I saw what looked like a very large Bigfoot standing at the top of the ridge near a tree.  I told myself that it was probably just a large stump that looked like a silhouette of Bigfoot on the ridge.  I even pointed it out to my 12 year old son, that that stump looked just like a Bigfoot.  We both laughed and agreed that it did. We continued up the little road for less than 100 yards, and found that it was a dead end.  We turned around and on the way down I looked back to where I saw the stump, and it was gone!. Less than 3 minutes had gone by. I stopped the truck and told my son that the stump was gone.  We searched the skyline and couldn't find it again. To this day, I really do not know what that was on the skyline, and I am not convinced that it was in fact a Bigfoot (I am a beliver), but it was something that I can not explain.