Reminds me of when we had some guy round to fell a row of old pines on the farm. I was maybe 8. They were next to a new post and rail fence on a steep slope. Employee of my Dad's expressed doubt that they could be felled without destroying the fence. The gaffer of the team stared him down, took a 1x1" 4ft stake, walked up the hill about 40ft and said "I'm going to drive that stake into the ground with the trunk of this tree".
He did, too. Hit it exactly square on, drove it all 4ft into the ground. Absolutely amazing skills.