An account in Westmoreland County, Pennsylvania

I picked up my uncle from work. We were traveling down Rt. 66 towards Delmont. We were traveling up the hill where the rvs are sold on the right hand side near the gas facility. I was driving at 45 MPH When my uncle says " what the hell is that?" I asked what he saw and his reply was " what ever it is it was walking on two feet. The sighting was quick no longer then 5-6 seconds at a distance of 70 yards on a cloudless moon lit night.My uncle said the subject was walking up the steep embankment that is covered in almost a foot of snow and bare of trees or brush behind the rv building on a horizontal path on two legs towards the woodline on top of the hill. He described the color as a uniform black. With no distinguishing clothing. The size he said was at least his size maybe bigger. my uncles is 6'4" and 250 pounds and he even said it was the size that caught his eye. We can't think of any reason a person would try to traverse such a steep incline or even going to the top of the hill cause there is nothing but woods once u reach the top. My uncle said it was spooky because he couldn't think of any reason either. I laughed and jokingly said it was bigfoot and with that my uncle started rambling about even if it was. No one would believe us. So I am contacting u to see if you guys could maybe solve this for us.