So we walked.
But when we got to the bottom of the hill and rounded the corner, he followed for a bit more but then stopped and started meowing. I guess he didn't want to go any farther.
I called him. That didn't work. I tried to shoo him back towards home. That didn't work. I really didn't want to leave him there and have some predator get him for dinner, so I picked the big lug up and carried him; for the rest of the walk!