Pai mei - there's a very good reason to make those cuts. Those beams were standing vertically in the rubble. The only way to bring them down in a controlled fashion is to make that kind of cut, working down the angle from top to bottom. It keeps the weight of the beam from pinching the cutting tool.
Anyone who's ever had any experience cutting down verticle weights will tell you the exact same thing. It's the most efficient way, and it is actually the BEST way to make sure the load DOESN'T come down on your (or anyone else's) head. A horizontal cut is unstable and damages your equipment.
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