Hope the homeowner checked the guy's bond. It looks like he had cut two notches. One is up higher than he's working. Anytime there are structures involved, you use a line. He could have put one on right up until the last swing of the sledge.
Once when my wife was helping me cut firewood, I misjudged the way a tree wanted to fall. It was a very tall oak and my Jeep with a trailer was too close. And there was no real road. We had just came through the woods. But I stopped sawing in time to get the vehicle moved. I had to cut a couple of smaller trees to make my escape. After that, my wife didn't help me with firewood all that often.