For the education those less experienced among us (e.g. me), what would you say the guy in the first video did wrong? I've bucked some good-sized trees that were already on the ground, but never had to fell a tree of any size. To me, it looks like he's handling the saw a little recklessly and moving his body around more than is necessary. It's hard to tell because of the low-res video but the hinge looks like it might've been a little insubstantial on the far side. What am I missing?